TY  - BOOK
AU  - Shimakura Norio
AU  - Shimakura Norio
TI  - Partial differential operators of elliptic type
SN  - 0-8218-4556-X
U1  - 510TM 
PY  - 1992///
CY  - Providence
PB  - AMS
KW  - Hypoelliptic operators
ER  -