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 
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/
@article{TM_1976_142_a17,
     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},
     year = {1976},
     volume = {142},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1976_142_a17/}
}
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