BAI, L.; NIETO, J. J. Positive solutions for singular impulsive Dirichlet boundary value problems. Topological Methods in Nonlinear Analysis, [S. l.], v. 52, n. 2, p. 561–584, 2018. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2018.017. Acesso em: 23 apr. 2024.