MAI, J.; SUN, T. Periodic orbits for multivalued maps with continuous margins of intervals. Topological Methods in Nonlinear Analysis, [S. l.], v. 48, n. 2, p. 453–464, 2016. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2016.052. Acesso em: 22 jul. 2024.