@article{1183511882,
author = {Willerding, Margaret F.},
title = {Determination of all classes of positive quaternary quadratic forms which represent all (positive) integers},
journal = {Bull. Amer. Math. Soc.},
volume = {54},
number = {12},
year = {1948},
pages = { 334-337},
language = {en},
url = {http://dml.mathdoc.fr/item/1183511882}
}
Willerding, Margaret F. Determination of all classes of positive quaternary quadratic forms which represent all (positive) integers. Bull. Amer. Math. Soc., Tome 54 (1948) no. 12, pp. 334-337. http://gdmltest.u-ga.fr/item/1183511882/