Gavrilyuk, I.P. (2007) “FD-method for an eigenvalue problem with nonlinear potential”, Ukrains’kyi Matematychnyi Zhurnal, 59(1), pp. 14–28. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3289 (Accessed: 6 December 2025).