Imanbaev, N. S., and M. A. Sadybekov. “Construction of a Characteristic Determinant for One Type of Eigenvalue Problems under Integral Perturbation of Two Boundary Conditions”. Journal of Mathematics, Mechanics and Computer Science 104, no. 4 (December 19, 2019): 12–23. Accessed November 21, 2024. https://bm.kaznu.kz/index.php/kaznu/article/view/673.