TY  - JOUR
AU  - S. A. Vavilov
TI  - Geometric methods for investigating the solvability of a class of
JO  - Doklady Akademii Nauk
PY  - 1992
SP  - 206
EP  - 210
VL  - 323
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1992_323_2_a2/
LA  - ru
ID  - DAN_1992_323_2_a2
ER  -