SELMER, E. S. The exceptional points of a cubic curve which is symmetric in the homogeneous variables. MATHEMATICA SCANDINAVICA, [S. l.], v. 2, p. 226–235, 1954. DOI: 10.7146/math.scand.a-10409. Disponível em: https://www.mscand.dk/article/view/10409. Acesso em: 2 may. 2024.