@article{GDZPPN002373416,
title = {On the representation of a binary quadratic form as a sum of squares of linear forms},
journal = {Mathematische Zeitschrift},
volume = {34},
year = {1932},
pages = {1-15},
zbl = {0003.33804},
url = {http://dml.mathdoc.fr/item/GDZPPN002373416}
}
Mordell, L. J.,. On the representation of a binary quadratic form as a sum of squares of linear forms. Mathematische Zeitschrift, Tome 34 (1932) pp. 1-15. http://gdmltest.u-ga.fr/item/GDZPPN002373416/