@article{bwmeta1.element.bwnjournal-article-aav19i4p321bwm,
author = {Hunsucker, John},
title = {Primitive representation of a binary quadratic form as a sum of four squares},
journal = {Acta Arithmetica},
volume = {18},
year = {1971},
pages = {321-325},
zbl = {0226.10029},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-aav19i4p321bwm}
}
Hunsucker, John. Primitive representation of a binary quadratic form as a sum of four squares. Acta Arithmetica, Tome 18 (1971) pp. 321-325. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-aav19i4p321bwm/