TY  - JOUR
AU  - V. I. Feigin
TI  - Asymptotic distribution of eigenvalues for hypoelliptic systems in~$R^n$
JO  - Sbornik. Mathematics
PY  - 1976
SP  - 533
EP  - 552
VL  - 28
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1976_28_4_a6/
LA  - en
ID  - SM_1976_28_4_a6
ER  -