TY  - DATA
AU  - C. Rockland
TI  - Hypoellipticity and Eigenvalue Asymptotics
T2  - Lecture Notes in Mathematics
SN  - 9783540375111
PY  - 1975///
CY  - Heidelberg
PB  - Springer Berlin
KW  - Mathematics and Statistics
UR  - https://doi.org/10.1007/BFb0096096
ER  -