@article{GDZPPN002470624, title = {On the Equation ax2 + by2 - cz2 = 0.}, journal = {Monatshefte f\"ur Mathematik}, volume = {55}, year = {1951}, pages = {323-327}, url = {http://dml.mathdoc.fr/item/GDZPPN002470624} }
Mordell, L.J. On the Equation ax2 + by2 - cz2 = 0.. Monatshefte für Mathematik, Tome 55 (1951) pp. 323-327. http://gdmltest.u-ga.fr/item/GDZPPN002470624/