ZGLICZYŃSKI, P. Sharkovskii theorem for multidimensional perturbations of one-dimensional maps II. Topological Methods in Nonlinear Analysis, [S. l.], v. 14, n. 1, p. 169–182, 1999. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1999.027. Acesso em: 3 jul. 2024.