- Batirkhan Turmetov, Valery Karachik, “Construction of Eigenfunctions to One Nonlocal Second-Order Differential Operator with Double Involution”, Axioms, 11, no. 10, 2022, 543
- Moldir Muratbekova, Bakhtiyar Kadirkulov, Maira Koshanova, Batirkhan Turmetov, “On Solvability of Some Inverse Problems for a Fractional Parabolic Equation with a Nonlocal Biharmonic Operator”, Fractal Fract, 7, no. 5, 2023, 404
- Batirkhan Turmetov, Valery Karachik, “On solvability of some inverse problems for a nonlocal fourth-order parabolic equation with multiple involution”, MATH, 9, no. 3, 2024, 6832
- Abdissalam Sarsenbi, Abdizhahan Sarsenbi, “On Eigenfunctions of the Boundary Value Problems for Second Order Differential Equations with Involution”, Symmetry, 13, no. 10, 2021, 1972
- Valery Karachik, Batirkhan Turmetov, Hongfen Yuan, “Four Boundary Value Problems for a Nonlocal Biharmonic Equation in the Unit Ball”, Mathematics, 10, no. 7, 2022, 1158
- Moldir Muratbekova, Valery Karachik, Batirkhan Turmetov, “Bitsadze-Samarsky type problems with double involution”, Bound Value Probl, 2024, no. 1, 2024, 86