H. Hyperbolische 5-Rechtecke. Teaching Mathematics and Computer Science, [S. l.], v. 1, n. 1, p. 111–123, 2003. DOI: 10.5485/TMCS.2003.0007. Disponível em: https://ojs.lib.unideb.hu/tmcs/article/view/14687. Acesso em: 27 sep. 2024.