AARAO, J.; MARTELLI, M. Stationary states for discrete dynamical systems in the plane. Topological Methods in Nonlinear Analysis, [S. l.], v. 20, n. 1, p. 15–23, 2002. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2002.022. Acesso em: 28 mar. 2024.