SZABÓ, Sándor. Equivalence and range of quadratic forms. Teaching Mathematics and Computer Science, [S. l.], v. 3, n. 2, p. 123–129, 2005. DOI: 10.5485/TMCS.2005.0069. Disponível em: https://ojs.lib.unideb.hu/tmcs/article/view/14743. Acesso em: 27 sep. 2024.