KOČAN, Zdeněk. The problem of classification of triangular maps with zero topological entropy. Annales Mathematicae Silesianae, [S. l.], v. 13, p. 181–192, 1999. Disponível em: https://journals.us.edu.pl/index.php/AMSIL/article/view/14147. Acesso em: 15 dec. 2025.