ANDRES, J.; PASTOR, K. On a multivalued version of the Sharkovskii theorem and its application to differential inclusions, III. Topological Methods in Nonlinear Analysis, [S. l.], v. 22, n. 2, p. 369–386, 2003. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2003.046. Acesso em: 3 jul. 2024.