KREITH, K.; MENDLE, A. Toward A Coherent Treatment of Negative Numbers. Journal of Mathematics Education at Teachers College, [S. l.], v. 4, n. 1, 2013. DOI: 10.7916/jmetc.v4i1.775. Disponível em: https://journals.library.columbia.edu/index.php/jmetc/article/view/775. Acesso em: 27 apr. 2024.