SELMER, E. S. The diophantine equation $\eta^2= \xi^3 - D$. A note on Cassels’ method. MATHEMATICA SCANDINAVICA, [S. l.], v. 3, p. 68–74, 1955. DOI: 10.7146/math.scand.a-10426. Disponível em: https://www.mscand.dk/article/view/10426. Acesso em: 5 may. 2024.