@article{GDZPPN002399512, title = {Zur Definition quadratischer Formen.}, journal = {Mathematische Zeitschrift}, volume = {99}, year = {1967}, pages = {42-45}, zbl = {0146.25903}, url = {http://dml.mathdoc.fr/item/GDZPPN002399512} }
Röhrl, Helmut. Zur Definition quadratischer Formen.. Mathematische Zeitschrift, Tome 99 (1967) pp. 42-45. http://gdmltest.u-ga.fr/item/GDZPPN002399512/