ALSINA, C.; MONREAL, A. Proof without words: beyond the parallelogram law. Teaching Mathematics and Computer Science, [S. l.], v. 1, n. 1, p. 153–156, 2003. DOI: 10.5485/TMCS.2003.0003. Disponível em: https://ojs.lib.unideb.hu/tmcs/article/view/14690. Acesso em: 20 oct. 2024.