Kanguzhin, B. E., G. Dairbayeva, and Zh. Madibaiuly. “Uniqueness of the Restoration of Boundary Conditions Differential Operator on a Set of Spectra”. Journal of Mathematics, Mechanics and Computer Science 104, no. 4 (December 19, 2019): 44–49. Accessed December 4, 2024. https://bm.kaznu.kz/index.php/kaznu/article/view/675.