@article{GDZPPN002349124, title = {On the Diophantine Equation Ax4 -By2 = C (C = 1, 4).}, journal = {Mathematica Scandinavica}, volume = {20}, year = {1967}, pages = {149-158}, zbl = {0169.37302}, url = {http://dml.mathdoc.fr/item/GDZPPN002349124} }
Ljunggren, W. On the Diophantine Equation Ax4 -By2 = C (C = 1, 4).. Mathematica Scandinavica, Tome 20 (1967) pp. 149-158. http://gdmltest.u-ga.fr/item/GDZPPN002349124/