Geodesic
On the problem of determining perfect quadratic forms of several variables
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Number theory, mathematical analysis and their applications, Tome 142 (1976), pp. 215-239.

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     author = {S. S. Ryshkov},
     title = {On the problem of determining perfect quadratic forms of several variables},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {215--239},
     publisher = {mathdoc},
     volume = {142},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1976_142_a17/}
}
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S. S. Ryshkov. On the problem of determining perfect quadratic forms of several variables. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Number theory, mathematical analysis and their applications, Tome 142 (1976), pp. 215-239. http://geodesic.mathdoc.fr/item/TM_1976_142_a17/