NIETO, Juan J.; UZAL, José M. Periodic solutions of superlinear and sublinear state-dependent discontinuous differential equations. Topological Methods in Nonlinear Analysis, [S. l.], v. 58, n. 1, p. 79–96, 2021. DOI: 10.12775/TMNA.2021.016. Disponível em: https://apcz.umk.pl/TMNA/article/view/35220. Acesso em: 13 dec. 2025.