TY  - JOUR
AU  - V. V. Grushin
TI  - Hypoelliptic differential equations and pseudodifferential operators with operator-valued symbols
JO  - Sbornik. Mathematics
PY  - 1972
SP  - 497
EP  - 514
VL  - 17
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1972_17_4_a2/
LA  - en
ID  - SM_1972_17_4_a2
ER  -