TY  - JOUR
AU  - Nguen Min' Chi
TI  - Fourth-order hypoelliptic pseudodifferential operators with a noninvolutive characteristic set
JO  - Vestnik Moskovskogo universiteta. Matematika, mehanika
PY  - 1990
SP  - 71
EP  - 73
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/VMUMM_1990_2_a17/
LA  - ru
ID  - VMUMM_1990_2_a17
ER  -