TARCSI, Margit. Learning and Knowledge: The results, lessons and consequences of a development experiment on establishing the concept of length and perimeter. Teaching Mathematics and Computer Science, [S. l.], v. 5, n. 1, p. 119–145, 2007. DOI: 10.5485/TMCS.2007.0148. Disponível em: https://ojs.lib.unideb.hu/tmcs/article/view/14791. Acesso em: 27 sep. 2024.