TY  - JOUR
AU  - E. I. Ganzha
TI  - Hypoellipticity of a second-order differential operator
JO  - Vestnik Moskovskogo universiteta. Matematika, mehanika
PY  - 1985
SP  - 96
EP  - 99
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/VMUMM_1985_6_a17/
LA  - ru
ID  - VMUMM_1985_6_a17
ER  -