LEDET, Arne. Embedding problems and equivalence of quadratic forms. Mathematica Scandinavica, Berkeley, CA, United States, v. 88, n. 2, p. 279–302, 2001. DOI: 10.7146/math.scand.a-14327. Disponível em: https://journals.msp.org/mscand/article/view/878. Acesso em: 24 jul. 2026.