Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{CMH_1959__33_139160, author = {Walter Ledermann}, title = {An arithmetical property of quadratic forms.}, journal = {Commentarii mathematici Helvetici}, pages = {34--37}, publisher = {mathdoc}, volume = {33}, year = {1959}, zbl = {0082.25803}, url = {http://geodesic.mathdoc.fr/item/CMH_1959__33_139160/} }
Walter Ledermann. An arithmetical property of quadratic forms.. Commentarii mathematici Helvetici, Tome 33 (1959), pp. 34-37. http://geodesic.mathdoc.fr/item/CMH_1959__33_139160/