Jenaliyev, Muvasharkhan, Bekzat Orynbassar, and Madi Yergaliyev. “ON A SPECTRAL PROBLEM FOR A FOURTH-ORDER DIFFERENTIAL OPERATOR”. Journal of Mathematics, Mechanics and Computer Science 127, no. 3 (September 29, 2025). Accessed October 8, 2025. https://bm.kaznu.kz/index.php/kaznu/article/view/1634.