Amirov, R.K., Güldü, .Y. and Topsakal, N. (2010) “On impulsive Sturm–Liouville operators with Coulomb potential and spectral parameter linearly contained in boundary conditions”, Ukrains’kyi Matematychnyi Zhurnal, 62(9), pp. 1155–1172. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/2946 (Accessed: 5 December 2025).