@article{GDZPPN002057131, title = {An arithmetical property of quadratic forms.}, journal = {Commentarii mathematici Helvetici}, volume = {33}, year = {1959}, pages = {34-37}, zbl = {0082.25803}, url = {http://dml.mathdoc.fr/item/GDZPPN002057131} }
Ledermann, Walter. An arithmetical property of quadratic forms.. Commentarii mathematici Helvetici, Tome 33 (1959) pp. 34-37. http://gdmltest.u-ga.fr/item/GDZPPN002057131/