MORDELL, L. J. Note on simultaneous quadratic congruences. MATHEMATICA SCANDINAVICA, [S. l.], v. 5, p. 21–26, 1957. DOI: 10.7146/math.scand.a-10485. Disponível em: https://www.mscand.dk/article/view/10485. Acesso em: 2 may. 2024.