LJUNGGREN, W. On the Diophantine Equation $Ax^4-By^2=C$, ($C=1,4$). Mathematica Scandinavica, Berkeley, CA, United States, v. 21, p. 149–158, 1967. DOI: 10.7146/math.scand.a-10855. Disponível em: https://journals.msp.org/mscand/article/view/2475. Acesso em: 25 jul. 2026.