LJUNGGREN, W. On an improvement of a theorem of T. Nagell concerning the Diophantine equation $Ax^3 + By^3 = C$. MATHEMATICA SCANDINAVICA, [S. l.], v. 1, p. 297–309, 1953. DOI: 10.7146/math.scand.a-10388. Disponível em: https://www.mscand.dk/article/view/10388. Acesso em: 4 may. 2024.