LJUNGGREN, W. On the Diophantine Equation $Ax^4-By^2=C$, ($C=1,4$). MATHEMATICA SCANDINAVICA, [S. l.], v. 21, p. 149–158, 1967. DOI: 10.7146/math.scand.a-10855. Disponível em: https://tidsskrift.dk/math/article/view/10855. Acesso em: 14 aug. 2026.