Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1988_298_4_a11, author = {L. B. Rapoport}, title = {Sign-definiteness of a quadratic form under quadratic constraints}, journal = {Doklady Akademii Nauk}, pages = {822--826}, publisher = {mathdoc}, volume = {298}, number = {4}, year = {1988}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1988_298_4_a11/} }
L. B. Rapoport. Sign-definiteness of a quadratic form under quadratic constraints. Doklady Akademii Nauk, Tome 298 (1988) no. 4, pp. 822-826. http://geodesic.mathdoc.fr/item/DAN_1988_298_4_a11/