Geodesic
On the problem of determining perfect quadratic forms of several variables
Informatics and Automation, Number theory, mathematical analysis and their applications, Tome 142 (1976), pp. 215-239.

Voir la notice de l'article provenant de la source Math-Net.Ru

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     author = {S. S. Ryshkov},
     title = {On the problem of determining perfect quadratic forms of several variables},
     journal = {Informatics and Automation},
     pages = {215--239},
     publisher = {mathdoc},
     volume = {142},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1976_142_a17/}
}
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S. S. Ryshkov. On the problem of determining perfect quadratic forms of several variables. Informatics and Automation, Number theory, mathematical analysis and their applications, Tome 142 (1976), pp. 215-239. http://geodesic.mathdoc.fr/item/TRSPY_1976_142_a17/