SELMER, Ernst S. The exceptional points of a cubic curve which is symmetric in the homogeneous variables. Mathematica Scandinavica, Berkeley, CA, United States, v. 2, p. 226–235, 1954. DOI: 10.7146/math.scand.a-10409. Disponível em: https://journals.msp.org/mscand/article/view/2915. Acesso em: 25 jul. 2026.