TY  - JOUR
AU  - S. S. Ryshkov
TI  - On the problem of determining perfect quadratic forms of several variables
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1976
SP  - 215
EP  - 239
VL  - 142
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/TM_1976_142_a17/
LA  - ru
ID  - TM_1976_142_a17
ER  -