TY  - JOUR
AU  - I. D. Cherkasov
TI  - Tensor conditions for reducibility of elliptic and hyperbolic equations
JO  - Doklady Akademii Nauk
PY  - 1972
SP  - 43
EP  - 45
VL  - 203
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1972_203_1_a10/
LA  - ru
ID  - DAN_1972_203_1_a10
ER  -