AMIROV, R. Kh.; GÜLDÜ, Y.; TOPSAKAL, N. On impulsive Sturm - Liouville operators with singularity and spectral parameter in boundary conditions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 64, n. 12, p. 1610–1629, 2012. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2686. Acesso em: 5 dec. 2025.