STEPANOV, E. On solvability of some boundary value problems for differential equations with "maxima". Topological Methods in Nonlinear Analysis, [S. l.], v. 8, n. 2, p. 315–326, 1996. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1996.035. Acesso em: 19 apr. 2024.