AMIROV, R. Kh.; GÜLDÜ, Y.; TOPSAKAL, N. On impulsive Sturm–Liouville operators with Coulomb potential and spectral parameter linearly contained in boundary conditions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 62, n. 9, p. 1155–1172, 2010. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2946. Acesso em: 5 dec. 2025.