SELMER, Ernst S. Sufficient congruence conditions for the existence of rational points on certain cubic surfaces. Mathematica Scandinavica, Berkeley, CA, United States, v. 1, p. 113–119, 1953. DOI: 10.7146/math.scand.a-10370. Disponível em: https://journals.msp.org/mscand/article/view/2953. Acesso em: 25 jul. 2026.