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2017
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1.
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М. А. Садыбеков, Н. С. Иманбаев, “Регулярный дифференциальный оператор с возмущенным краевым условием”, Матем. заметки, 101:5 (2017), 768–778; M. A. Sadybekov, N. S. Imanbaev, “A regular differential operator with perturbed boundary condition”, Mathematical Notes, 101:5–6 (2017), 878–887 (cited: 12)
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2.
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A. Sadybekov, G. Dildabek, A. Tengayeva, “Constructing a basis from systems of eigenfunctions of one not strengthened regular boundary value problem”, Filomat, 31:4 (2017), 981–987 (cited: 13)
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3.
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M. A. Sadybekov, B. T. Torebek, B. Kh. Turmetov, “Representation of the Green’s function of the exterior Neumann problem for the Laplace operator”, Siberian Mathematical Journal, 58:1 (2017), 153–158 (cited: 14);
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4.
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A. Sadybekov, G. Oralsyn, M. Ismailov, “An inverse problem of finding the time-dependent heat transfer coefficient from an integral condition”, International Journal of Pure and Applied Mathematics, 113:4 (2017), 139–149
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5.
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Otelbaev, M. A. Sadybekov, B. I. Tuleuov, “Integral model and forecasting of vector dynamic series of economic parameters”, International Journal of Pure and Applied Mathematics, 113:4 (2017), 125–138
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6.
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T. Sh. Kal'menov, M. A. Sadybekov, “On a Frankl-type problem for a mixed parabolic-hyperbolic equation”, Siberian Mathematical Journal, 58:2 (2017), 227–231;
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7.
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Kassymov, M. Sadybekov, D. Suragan, “On Isoperimetric Inequalities for the Cauchy-Robin Heat Operator”, Math. Model. Nat. Phenom., 12:3 (2017), 114–118 (cited: 2)
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8.
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Sadybekov, G. Oralsyn, “On trace formulae of the generalised heat potential operator”, J. Pseudo-Differ. Oper. Appl., 2017 (Published online)
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9.
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Iskakova, M. A. Sadybekov, “On one inhomogeneous model of oscillations of a thin flat plate with a variety of mounts on opposite sides”, International Conference “Functional Analysis in Interdisciplinary Applications” (FAIA2017) (Astana, Okt 02–05, 2017), AIP Conference Proceedings, 1880, eds. Tynysbek Kal’menov and Makhmud Sadybekov, American Institute of Physics, Melville, NY, 2017, 060020 http://dx.doi.org/10.1063/1.5000674
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10.
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E. Akhymbek, M. A. Sadybekov, “Correct restrictions of first-order functional–differential equation”, International Conference “Functional Analysis in Interdisciplinary Applications” (FAIA2017) (Astana, Okt 02–05, 2017), AIP Conference Proceedings, 1880, eds. Tynysbek Kal’menov and Makhmud Sadybekov, American Institute of Physics, Melville, NY, 2017, 050014 http://dx.doi.org/10.1063/1.5000651
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11.
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S. Imanbaev, M. A. Sadybekov, “About characteristic determinant of one boundary value problem not having the basis property”, International Conference “Functional Analysis in Interdisciplinary Applications” (FAIA2017) (Astana, Okt 02–05, 2017), AIP Conference Proceedings, 1880, eds. Tynysbek Kal’menov and Makhmud Sadybekov, American Institute of Physics, Melville, NY, 2017, 050002 http://dx.doi.org/10.1063/1.5000639
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12.
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S. Kal’menov, M. A. Sadybekov, “Professor Mukhtarbay Otelbaev: Citation for his 75th birthday”, International Conference “Functional Analysis in Interdisciplinary Applications” (FAIA2017) (Astana, Okt 02–05, 2017), AIP Conference Proceedings, 1880, eds. Tynysbek Kal’menov and Makhmud Sadybekov, American Institute of Physics, Melville, NY, 2017, 020001 http://dx.doi.org/10.1063/1.5000599
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13.
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Kal’menov, M. Sadybekov, “Preface: International Conference “Functional Analysis in Interdisciplinary Applications”(FAIA2017)”, International Conference “Functional Analysis in Interdisciplinary Applications” (FAIA2017) (Astana, Okt 02–05, 2017), AIP Conference Proceedings, 1880, eds. Tynysbek Kal’menov and Makhmud Sadybekov, American Institute of Physics, Melville, NY, 2017, 010001 http://dx.doi.org/10.1063/1.5000598
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14.
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A. Sadybekov, N. S. Imanbaev, “Characteristic determinant of a boundary value problem, which does not have the basis property”, Eurasian Math. J., 8:2 (2017), 40–46 (cited: 1)
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15.
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Sadybekov, G. Oralsyn, “Nonlocal initial boundary value problem for the time-fractional diffusion equation”, Electronic Journal of Differential Equations, 2017, 201, 7 pp.
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16.
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Dildabek, M. A. Sadybekov, M. B. Saprygina, “On a Volterra property of an problem of the Frankl type for an equation of the mixed parabolic–hyperbolic type”, 43rd International Conference “Applications of Mathematics in Engineering and Economics” (AMEE’17) (Sozopol, Bulgaria, Jun 08–13, 2017), AIP Conference Proceedings, 1910, 2017, 040004 , 8 pp. https://doi.org/10.1063/1.5013971
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17.
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S. Imanbaev, M. A. Sadybekov, “Regular Sturm-Liouville Operators with Integral Perturbation of Boundary Condition”, Functional Analysis in Interdisciplinary Applications, Springer Proceedings in Mathematics & Statistics, 216, eds. Kalmenov T.S., Nursultanov E.D., Ruzhansky M.V., Sadybekov M.A., Springer, Cham, Switzerland, 2017, 222–234https://doi.org/10.1007/978-3-319-67053-9_21
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18.
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A. Sadybekov, “Initial-Boundary Value Problem for a Heat Equation with not Strongly Regular Boundary Conditions”, Functional Analysis in Interdisciplinary Applications, Springer Proceedings in Mathematics & Statistics, 216, eds. Kalmenov T.S., Nursultanov E.D., Ruzhansky M.V., Sadybekov M.A., Springer, Cham, Switzerland, 2017, 330–348https://doi.org/10.1007/978-3-319-67053-9_32
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19.
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S. Kalmenov, E. D. Nursultanov, M. V. Ruzhansky, M. A. Sadybekov, “Preface(Editorial)”, Functional Analysis in Interdisciplinary Applications, Springer Proceedings in Mathematics & Statistics, 216, eds. Kalmenov T.S., Nursultanov E.D., Ruzhansky M.V., Sadybekov M.A., Springer, Cham, Switzerland, 2017, v-vii
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2016
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20.
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Н. А. Есиркегенов, М. А. Садыбеков, “Спектральные свойства краевой задачи со смещением для волнового уравнения”, Изв. вузов. Матем., 2016, № 3, 48–54 ; N. A. Yessirkegenov, M. A. Sadybekov, “Spectral properties of boundary-value problem with a shift for wave equation”, Russian Math. (Iz. VUZ), 60:3 (2016), 41–46
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21.
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A. Sadybekov, B. T. Torebek, B. Kh. Turmetov, “Construction of Green’s function of the Neumann problem in a ball”, Eurasian Math. J., 7:2 (2016), 100–105
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22.
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A. Sadybekov, B. T. Torebek, B. Kh. Turmetov, “Representation of Green’s function of the Neumann problem for a multi-dimensional ball”, Complex Variables and Elliptic Equations, 61:1 (2016), 104–123 http://dx.doi.org/10.1080/17476933.2015.1064402 (cited: 1) (cited: 18) (cited: 19)
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23.
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A. Sadybekov, N. A. Yessirkegenov, “Boundary-value problems for wave equations with data on the whole boundary”, Electronic Journal of Differential Equations, 2016, 281, 9 pp. http://ejde.math.txstate.edu/Volumes/2016/281/sadybekov.pdf (cited: 9)
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24.
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Sh. Kal'menov, M. A. Sadybekov, U. A. Iskakova, “On a criterion for the solvability of one ill-posed problem for the biharmonic equation”, Journal of Inverse and Ill-Posed Problems, 24:6 (2016), 777–783 (cited: 16)
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25.
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E. Akhymbek, M. A. Sadybekov, “On a difference scheme for nonlocal heat transfer boundary-value problem”, 3rd International Conference on Analysis and Applied Mathematics (ICAAM) (Almaty, Inst Math & Math Modeling, Sep 07–10, 2016), AIP Conference Proceedings, 1759, 2016, 020032, 6 pp. (cited: 1)
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26.
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Imanbaev, M. Sadybekov, “Stability of basis property of a periodic problem with nonlocal perturbation of boundary conditions”, 3rd International Conference on Analysis and Applied Mathematics (ICAAM) (Almaty, Inst Math & Math Modeling, Sep 07-10, 2016), AIP Conference Proceedings, 1759, 2016, 020080, 5 pp. (cited: 2)
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27.
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Sh. Kal'menov, M. Sadybekov, “On a problem of the Frankl type for an equation of the mixed parabolic-hyperbolic type”, 3rd International Conference on Analysis and Applied Mathematics (ICAAM) (Almaty, Inst Math & Math Modeling, Sep 07–10, 2016), AIP Conference Proceedings, 1759, 2016, 020001, 6 pp. (cited: 2)
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28.
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Sadybekov, A. Kassymov, “An isoperimetric inequality for heat potential and heat equation”, 3rd International Conference on Analysis and Applied Mathematics (ICAAM) (Almaty, Inst Math & Math Modeling, Sep 07–10, 2016), AIP Conference Proceedings, 1759, 2016, 020029, 5 pp.
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29.
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A. Sadybekov, N. A. Yessirkegenov, “Spectral properties of a Laplace operator with Samarskii-Ionkin type boundary conditions in a disk”, 3rd International Conference on Analysis and Applied Mathematics (ICAAM) (Almaty, Inst Math & Math Modeling, Sep 07–10, 2016), AIP Conference Proceedings, 1759, 2016, 020139, 5 pp.
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30.
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A. Sadybekov, A. M. Sarsenbi, A. Tengaeva, “Description of spectral properties of a generalized spectral problem with involution for differentiation operator of the second order”, 3rd International Conference on Analysis and Applied Mathematics (ICAAM) (Almaty, Inst Math & Math Modeling, Sep 07–10, 2016), AIP Conference Proceedings, 1759, 2016, 020154, 7 pp.
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31.
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A. Sadybekov, B. T. Torebek, “On some spectral inequalities for a nonlocal elliptic problem”, 3rd International Conference on Analysis and Applied Mathematics (ICAAM) (Almaty, Inst Math & Math Modeling, Sep 07–10, 2016) (Almaty), AIP Conference Proceedings, 1759, 2016, 020123, 5 pp.
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32.
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A. Sadybekov, “On an Samarskii-Ionkin boundary value problem for the Poisson equation in a disk”, 42nd International Conference on Applications of Mathematics in Engineering and Economics (AMEE) (Sozopol, BULGARIA, JUN 08-13, 2016), AIP Conference Proceedings, 1789, 2016, UNSP 040024, 7 pp.
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33.
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Sadybekov, B. Torebek, “On a Class of Nonlocal Boundary Value Problems for the Laplace Operator in a Disk”, 42nd International Conference on Applications of Mathematics in Engineering and Economics (AMEE) (Sozopol, BULGARIA, JUN 08-13, 2016), AIP Conference Proceedings, 1789, 2016, UNSP 040025, 6 pp.
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2015
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34.
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V. Karachik, M. A. Sadybekov, B. T. Torebek, “Uniqueness of solutions to boundary-value problems for the biharmonic equation in a ball”, Electronic Journal of Differential Equations, 2015, 244, 9 pp. (cited: 7)
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35.
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E. Akhymbek, N. A. Yessirkegenov, M. A. Sadybekov, “Renovation of the fixing and loading factors of the beam by the spectral data of free flexural vibrations”, International Conference on Advancements in Mathematical Sciences (AMS 2015) (Antalya, Turkey, Nov 05-07, 2015), AIP Conference Proceedings, 1676, 2015, 020058, 6 pp. (cited: 2)
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36.
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S. Imanbaev, M. A. Sadybekov., “On instability of basis property of the root vectors system of the double differentiation operator with an integral perturbation of periodic type conditions”, International Conference on Advancements in Mathematical Sciences (AMS 2015) (Antalya, Turkey, Nov 05-07, 2015), AIP Conference Proceedings, 1676, 2015, 020083, 5 pp. (cited: 1)
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37.
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Oralsyn, M. A. Sadybekov, “An inverse coefficient problem of heat conductivity with a nonlocal Samarskii-Ionkin type condition”, International Conference on Advancements in Mathematical Sciences (AMS 2015) (Antalya, Turkey, Nov 05-07, 2015), AIP Conference Proceedings, 1676, 2015, 020016, 5 pp. (cited: 5)
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38.
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Orazov, M. A. Sadybekov, “On an inverse problem of mathematical modeling of the extraction process of polydisperse porous materials”, International Conference on Advancements in Mathematical Sciences (AMS 2015) (Antalya, Turkey, Nov 05-07, 2015), AIP Conference Proceedings, 1676, 2015, 020005, 4 pp. (cited: 1)
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39.
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A. Sadybekov, B. T. Torebek, “On a new class of nonlocal problems for the Laplace operator”, International Conference on Advancements in Mathematical Sciences (AMS 2015) (Antalya, Turkey, Nov 05-07, 2015), AIP Conference Proceedings, 1676, 2015, 020073, 5 pp. (cited: 4)
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40.
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AU M. A. Sadybekov, B. T. Torebek, N. A. Yessirkegenov, “On an analog of Samarskii-Ionkin type boundary value problem for the Poisson equation in the disk”, International Conference on Advancements in Mathematical Sciences (AMS 2015) (Antalya, Turkey, Nov 05-07, 2015), AIP Conference Proceedings, 1676, 2015, 020035, 5 pp. (cited: 3)
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41.
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Orazov, M. A. Sadybekov, “One-dimensional Diffusion Problem with not Strengthened Regular Boundary Conditions”, 41st International Conference Applications of Mathematics in Engineering and Economics (AMEE'15) (Sozopol, Bulgaria, Jun 08-13, 2015), AIP Conference Proceedings, 1690, 2015, 040007, 6 pp. (cited: 6)
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42.
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A. Sadybekov, B. Kh. Turmetov, B. T. Torebek, “On an explicit form of the Green function of the Robin problem for the Laplace operator in a circle”, Adv. Pure Appl. Math., 6:3 (2015), 163–172 (cited: 2)
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2014
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43.
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A. Besbaev, I. Orazov, M. A. Sadybekov, “A nonlocal boundary problem for the Laplace operator in a half disk”, Electronic Journal of Differential Equations, 2014, 203, 5 pp. (cited: 8)
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44.
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A. Sadybekov, N. A. Yessirkegenov, “Properties of solutions to Neumann-Tricomi problems for Lavrent'ev-Bitsadze equations at corner points”, Electronic Journal of Differential Equations, 2014, 193, 9 pp. (cited: 4)
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45.
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A. Sadybekov, B. Kh. Turmetov, B. T. Torebek, “Solvability of nonlocal boundary-value problems for the Laplace equation in the ball”, Electronic Journal of Differential Equations, 2014, 157, 14 pp. (cited: 11)
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46.
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A. Sadybekov, B. Kh. Turmetov, “On an analog of periodic boundary value problems for the Poisson equation in the disk”, Differential Equations, 50:2 (2014), 268–273 (cited: 19)
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47.
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A. Sadybekov, B. Kh. Turmetov, M. A. Muratbekova, “On solvability of some nonlocal boundary value problems with the Hadamard boundary operator”, International Conference on Analysis and Applied Mathematics (ICAAM 2014) (Shymkent, Kazakhstan, Sep 11-13, 2014), AIP Conference Proceedings, 1611, 2014, 266-270 (cited: 3) (cited: 4)
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48.
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A. Sadybekov, N. A. Yessirkegenov, “A criterion for the strong solvability of the Neumann-Tricomi problem for the Lavrent'ev-Bitsadze equation in L-p”, International Conference on Analysis and Applied Mathematics (ICAAM 2014) (Shymkent, Kazakhstan, Sep 11-13, 2014), AIP Conference Proceedings, 1611, 2014, 112-118
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49.
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A. Sadybekov, M. E. Akhymbek, “Spectral properties of some non strongly regular boundary value problems for fourth order differential operators”, International Conference on Analysis and Applied Mathematics (ICAAM 2014) (Shymkent, Kazakhstan, Sep 11-13, 2014), AIP Conference Proceedings, 1611, 2014, 156-160 (cited: 3)
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50.
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M. Sarsenbi, M. A. Sadybekov, “Eigenfunctions of a fourth order operator pencil”, International Conference on Analysis and Applied Mathematics (ICAAM 2014) (Shymkent, Kazakhstan, Sep 11-13, 2014), AIP Conference Proceedings, 1611, 2014, 241-245 (cited: 2)
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51.
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A. Sadybekov, B. T. Torebek, B. Kh. Turmetov, “On an explicit form of the Green function of the third boundary value problem for the Poisson equation in a circle”, International Conference on Analysis and Applied Mathematics (ICAAM 2014) (Shymkent, Kazakhstan, Sep 11-13, 2014), AIP Conference Proceedings, 1611, 2014, 255-260 (cited: 16) (cited: 20)
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52.
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S. Imanbaev, M. A. Sadybekov, “Characteristic determinant of the spectral problem for the ordinary differential operator with the boundary load”, International Conference on Analysis and Applied Mathematics (ICAAM 2014) (Shymkent, Kazakhstan, Sep 11-13, 2014), AIP Conference Proceedings, 1611, 2014, 261-265 (cited: 6)
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2013
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53.
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S. Imanbaev, M. A. Sadybekov, “On spectral properties of a periodic problem with an integral perturbation of the boundary condition”, Eurasian Math. J., 4:3 (2013), 53–62 (cited: 2)
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2012
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54.
|
И. Оразов, М. А. Садыбеков, “Об одной нелокальной задаче определения температуры и плотности источников тепла”, Изв. вузов. Матем., 2012, № 2, 70–75 (цит.: 14) (цит.: 1); I. Orazov, M. A. Sadybekov, “One nonlocal problem of determination of the temperature and density of heat sources”, Russian Math. (Iz. VUZ), 56:2 (2012), 60–64 (cited: 16)
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55.
|
И. Оразов, М. А. Садыбеков, “Об одном классе задач определения температуры и плотности источников тепла по начальной и конечной температурам”, Сиб. матем. журн., 53:1 (2012), 180–186 (цит.: 23) (цит.: 2); I. Orazov, M. A. Sadybekov, “On a class of problems of determining the temperature and density of heat sources given initial and final temperature”, Siberian Math. J., 53:1 (2012), 146–151 (cited: 16) (cited: 6) (cited: 31)
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56.
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A. Sadybekov, B. K. Turmetov, “On analogues of periodic boundary value problems for the Laplace operator in a ball”, Eurasian Math. J., 3:1 (2012), 143–146 (cited: 3) (cited: 2)
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57.
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A. Sadybekov, A. M. Sarsenbi, “Criterion for the basis property of the eigenfunction system of a multiple differentiation operator with an involution”, Differential Equations, 48:8 (2012), 1112-1118 (cited: 4) (cited: 16) (cited: 25)
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58.
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A. Sadybekov, N. S. Imanbaev, “On the basis property of root functions of a periodic problem with an integral perturbation of the boundary condition”, Differential Equations, 48:6 (2012), 896–900 (cited: 1) (cited: 9) (cited: 25)
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59.
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A. Sadybekov, A. M. Sarsenbi, “Issues of basis property related to the choice of associated functions of differential operators”, Mathematica, 54:77 (2012), 177–184
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60.
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A. Sadybekov, A. M. Sarsenbi, “Mixed Problem for a Differential Equation with Involution Under Boundary Conditions of General Form”, 1st International Conference on Analysis and Applied Mathematics (ICAAM 2012) (Gumushane, Turkey, Oct 18-21, 2012), AIP Conference Proceedings, 1470, 2012, 225-227 (cited: 26)
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2011
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61.
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Н. С. Иманбаев, М. А. Садыбеков, “Об устойчивости свойства базисности одного типа задач на собственные значения при нелокальном возмущении краевого условия”, Уфимск. матем. журн., 3:2 (2011), 28–33 (цит.: 2) ; N. S. Imanbaev, M. A. Sadybekov, “Stability of basis property of a type of problems on eigenvalues with nonlocal perturbation of boundary conditions”, Ufa Mathematical Journal, 3:2 (2011), 27–32
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62.
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М. А. Садыбеков, А. М. Сарсенби, “Об одном необходимом условии базисности системы нормированных элементов в гильбертовом пространстве”, Вестн. Томск. гос. ун-та. Матем. и мех., 2011, № 1, 44–46 (цит.: 1)
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63.
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М. А. Садыбеков, Т. Ш. Кальменов, А. М. Сарсенби, “Биортогональные разложения по корневым функциям дифференциальных операторов”, Дифференциальные уравнения, 47:1 (2011), 144–148 (цит.: 1) (цит.: 7); T. Sh. Kal'menov, M. A. Sadybekov, A. M. Sarsenbi, “Biorthogonal Expansions in Root Functions of Differential Operators”, Differential Equations, 47:1 (2011), 144–148 (cited: 17) (cited: 25)
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2008
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64.
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М. А. Садыбеков, А. М. Сарсенби, “К теории антиаприорных оценок в смысле В.А.Ильина”, Доклады РАН, 420:3 (2008), 316–319 ; M. A. Sadybekov, A. M. Sarsenbi, “On the theory of antiprior estimates in the sense of VA Il'in”, Doklady Mathematics, 77:3 (2008), 398–400 (cited: 2) (cited: 9) (cited: 22)
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65.
|
М. А. Садыбеков, А. М. Сарсенби, “Применение оценок антиаприорного типа в теории базисов пространства L2L2”, Дифференциальные уравнения, 44:5 (2008), 665–671 (цит.: 2); M. A. Sadybekov, A. M. Sarsenbi, “The use of anti-A priori estimates in the theory of bases in the space L(2)”, Differential Equations, 44:5 (2008), 685–691 (cited: 2) (cited: 11) (cited: 24)
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1994
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66.
|
М. А. Садыбеков, “Краевая задача нового типа для волнового уравнения”, Доклады РАН, 336:5 (1994), 564–567 ; M. A. Sadybekov, “The boundary-value problem of a new-type for a wave-equation”, Doklady Akademii Nauk, 336:5 (1994), 590–591
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1993
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67.
|
М. А. Садыбеков, Т. Ш. Кальменов, Н. Е. Ержанов, “Критерий сильной разрешимости задачи Трикоми для уравнения Лаврентьева-Бицадзе. Общий случай”, Дифференциальные уравнения, 29:5 (1993), 870–875 (цит.: 2); T. Sh. Kal'menov, M. A. Sadybekov, N. E. Erzhanov, “A criterion for the strong solvability of the Tricomi problem for the Lavrent'ev–Bitsadze equation. The general case”, Differ. Equ., 29:5 (1993), 745–750
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1992
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68.
|
Е. М. Орынбасаров, М. А. Садыбеков, “Базисность системы собственных и присоединенных функций краевой задачи со смещением для волнового уравнения”, Матем. заметки, 51:5 (1992), 86–89 (цит.: 1) ; E. M. Orynbasarov, M. A. Sadybekov, “The basis property of the system of eigen- and associated functions of a boundary value problem with shift for the wave equation”, Math. Notes, 51:5 (1992), 482–484
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69.
|
М. А. Садыбеков, Н. О. Егисбаев, “О сопряженной к обобщенной задаче Трикоми для уравнения Лаврентьева-Бицадзе”, Дифференциальные уравнения, 28:1 (1992), 75–81 (цит.: 1); N. O. Egisbaev, M. A. Sadybekov, “On a problem conjugate to the generalized Tricomi problem for the Lavrent'ev–Bitsadze equation”, Differ. Equ., 28:1 (1992), 73–78
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70.
|
М. А. Садыбеков, Г. Д. Тойжанова, “Спектральные свойства одного класса краевых задач для параболо-гиперболического уравнения”, Дифференциальные уравнения, 28:1 (1992), 183–186 (цит.: 1) (цит.: 3)
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71.
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М. А. Садыбеков, Е. М. Орынбасаров, “Базисность системы корневых функций краевой задачи со со смещением для уравнения Лаврентьева-Бицадзе”, Доклады АН СССР, 324:6 (1992), 1152–1154 ; M. A. Sadybekov, E. M. Orynbasarov, “Baseness of the system of the eigenfunctions and associated functions with displacement of Lavrentev-Bitsadze equation”, Doklady Akademii Nauk, 324:6 (1992), 1152–1154
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1990
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72.
|
М. А. Садыбеков, Т. Ш. Кальменов, “О задаче Дирихле и нелокальных краевых задачах для волнового уравнения”, Дифференциальные уравнения, 26:1 (1990), 60–65 (цит.: 2) ; T. Sh. Kal'menov, M. A. Sadybekov, “The Dirichlet problem and nonlocal boundary value problems for the wave equation”, Differential Equations, 26:1 (1990), 55–59
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73.
|
М. А. Садыбеков, “О сопряженной задаче Дарбу”, Доклады АН СССР, 314:2 (1990), 304–306 ; M. A. Sadybekov, “On the conjugate Darboux problem”, Doklady Akademii Nauk, 314:2 (1990), 304–306
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