@article{GDZPPN002053055, title = {\"Uber die Zerlegung strikte definiter Formen in Quadrate.}, journal = {Commentarii mathematici Helvetici}, volume = {12}, year = {1939}, pages = {317-322}, zbl = {66.0051.01}, url = {http://dml.mathdoc.fr/item/GDZPPN002053055} }
Habicht, W. Über die Zerlegung strikte definiter Formen in Quadrate.. Commentarii mathematici Helvetici, Tome 12 (1939) pp. 317-322. http://gdmltest.u-ga.fr/item/GDZPPN002053055/