SIEMASZKO, A. A natural family of factors for product $\mathbb{Z}^2$-actions. Topological Methods in Nonlinear Analysis, [S. l.], v. 32, n. 1, p. 187–197, 2008. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2008.045. Acesso em: 19 apr. 2024.