SELMER, Ernst S. The diophantine equation $\eta^2= \xi^3 - D$. A note on Cassels’ method. Mathematica Scandinavica, Berkeley, CA, United States, v. 3, p. 68–74, 1955. DOI: 10.7146/math.scand.a-10426. Disponível em: https://journals.msp.org/mscand/article/view/2893. Acesso em: 8 sep. 2026.