@article{1183495852,
author = {Mordell, L. J.},
title = {Note on the diophantine equation $ax^2 + by^2 + cz^2 + dt^2 = 0$},
journal = {Bull. Amer. Math. Soc.},
volume = {38},
number = {12},
year = {1932},
pages = { 277-282},
language = {en},
url = {http://dml.mathdoc.fr/item/1183495852}
}
Mordell, L. J. Note on the diophantine equation $ax^2 + by^2 + cz^2 + dt^2 = 0$. Bull. Amer. Math. Soc., Tome 38 (1932) no. 12, pp. 277-282. http://gdmltest.u-ga.fr/item/1183495852/