Zharullayev, D. B., B. E. Kanguzhin, and M. N. Konyrkulzhayeva. “Green’s Function of Differential Operators on a Star-Shaped Graph With Common Boundary Conditions”. Journal of Mathematics, Mechanics and Computer Science 101, no. 1 (April 23, 2019): 48–58. Accessed November 21, 2024. https://bm.kaznu.kz/index.php/kaznu/article/view/601.