AmirovR. K., Güldü Y. and TopsakalN. (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: 1September2024).