Voir la notice de l'article provenant de la source Math-Net.Ru
@article{TRSPY_1971_112_a12, author = {B. N. Delone and S. S. Ryshkov}, title = {Extremal problems of the theory of positive quadratic forms}, journal = {Informatics and Automation}, pages = {203--223}, publisher = {mathdoc}, volume = {112}, year = {1971}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TRSPY_1971_112_a12/} }
B. N. Delone; S. S. Ryshkov. Extremal problems of the theory of positive quadratic forms. Informatics and Automation, Collection of articles. Part I, Tome 112 (1971), pp. 203-223. http://geodesic.mathdoc.fr/item/TRSPY_1971_112_a12/