SELMER, Ernst S. Sufficient congruence conditions for the existence of rational points on certain cubic surfaces. MATHEMATICA SCANDINAVICA, [S. l.], v. 1, p. 113–119, 1953. DOI: 10.7146/math.scand.a-10370. Disponível em: https://tidsskrift.dk/math/article/view/10370. Acesso em: 14 aug. 2026.