GavrilyukI. P., KlymenkoA. V., MakarovV. L., and RossokhataN. O. “FD-Method for an Eigenvalue Problem With Nonlinear Potential”. Ukrains’kyi Matematychnyi Zhurnal 59, no. 1 (January 25, 2007): 14–28. Accessed July 27, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3289.