V. V. Karachik, “Sufficient conditions for solvability of one class of Neumann-type problems for the polyharmonic equation”, Comput. Math. Math. Phys., 61:8 (2021), 1276–1288
Valery V. Karachik, Batirkhan Kh. Turmetov, Springer Proceedings in Mathematics & Statistics, 351, Functional Analysis in Interdisciplinary Applications—II, 2021, 75
V. V. Karachik, “Usloviya razreshimosti zadachi Neimana $\mathcal{N}_2$ dlya poligarmonicheskogo uravneniya v share”, Vestn. Yuzhno-Ur. un-ta. Ser. Matem. Mekh. Fiz., 12:2 (2020), 13–20
V. V. Karachik, “Class of Neumann-type problems for the polyharmonic equation in a ball”, Comput. Math. Math. Phys., 60:1 (2020), 144–162
V. V. Karachik, “Neumann Type Problems for the Polyharmonic Equation in Ball”, J Math Sci, 249:6 (2020), 974
Valery Karachik, Batirkhan Turmetov, “On solvability of some nonlocal boundary value problems for biharmonic equation”, Mathematica Slovaca, 70:2 (2020), 329
V. V. Karachik, “The Green function of the Dirichlet problem for the biharmonic equation in a ball”, Comput. Math. Math. Phys., 59:1 (2019), 66–81
Valery Karachik, “Green's function of Dirichlet problem for biharmonic equation in the ball”, Complex Variables and Elliptic Equations, 64:9 (2019), 1500
Valery V. Karachik, Batirkhan K. Turmetov, “On Green's function of the Robin problem for the Poisson equation”, Advances in Pure and Applied Mathematics, 10:3 (2019), 203
Djumaklich Amanov, Gafurjan Ibragimov, Adem K{\i}lıçman, “On a Generalization of the Initial-Boundary Problem for the Vibrating String Equation”, Symmetry, 11:1 (2019), 73