LEDET, A. Embedding problems and equivalence of quadratic forms. MATHEMATICA SCANDINAVICA, [S. l.], v. 88, n. 2, p. 279–302, 2001. DOI: 10.7146/math.scand.a-14327. Disponível em: https://www.mscand.dk/article/view/14327. Acesso em: 6 may. 2024.