@article{GDZPPN002432625,
title = {Sums of Squares of Linear Forms.},
journal = {Mathematische Zeitschrift},
volume = {192},
year = {1986},
pages = {297-306},
zbl = {0598.10032},
url = {http://dml.mathdoc.fr/item/GDZPPN002432625}
}
Baeza, R.; Leep, D.; O'Ryan, M. Sums of Squares of Linear Forms.. Mathematische Zeitschrift, Tome 192 (1986) pp. 297-306. http://gdmltest.u-ga.fr/item/GDZPPN002432625/