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@article{MS2_1967__21_166015, author = {W. Ljunggren}, title = {On the {Diophantine} {Equation} {Ax4} {-By2} = {C} {(C} = 1, 4).}, journal = {Mathematica Scandinavica}, pages = {149--158}, publisher = {mathdoc}, volume = {21}, year = {1967}, zbl = {0169.37302}, url = {http://geodesic.mathdoc.fr/item/MS2_1967__21_166015/} }
W. Ljunggren. On the Diophantine Equation Ax4 -By2 = C (C = 1, 4).. Mathematica Scandinavica, Tome 21 (1967), pp. 149-158. http://geodesic.mathdoc.fr/item/MS2_1967__21_166015/