VAJDA, István. Learning and teaching combinatorics with Sage. Teaching Mathematics and Computer Science, [S. l.], v. 10, n. 2, p. 389–398, 2012. DOI: 10.5485/TMCS.2012.0322. Disponível em: https://ojs.lib.unideb.hu/tmcs/article/view/14924. Acesso em: 27 sep. 2024.