Aliev, B. A. (2006) “Asymptotic behavior of the eigenvalues of a boundary-value problem for a second-order elliptic operator-differential equation”, Ukrains’kyi Matematychnyi Zhurnal, 58(8), pp. 1146–1152. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3519 (Accessed: 20April2024).