TY  - JOUR
AU  - V. S. Fedii
TI  - An example of a second-order nonhypoelliptic operator with the property of global hypoellipticity
JO  - Matematičeskie zametki
PY  - 1972
SP  - 269
EP  - 274
VL  - 12
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1972_12_3_a6/
LA  - ru
ID  - MZM_1972_12_3_a6
ER  -