SZEREDI, Éva. Forming the concept of congruence I. Teaching Mathematics and Computer Science, [S. l.], v. 9, n. 2, p. 181–192, 2011. DOI: 10.5485/TMCS.2011.0247. Disponível em: https://ojs.lib.unideb.hu/tmcs/article/view/14894. Acesso em: 27 sep. 2024.