TY  - BOOK
AU  - Friberg Joran
TI  - Estimates for partially hypoelliptic differential operations
U1  - 515.7242 
PY  - 1963///
CY  - Lund
PB  - Hakan Ohlssons Boktryckeri
KW  - Calculus
KW  - Differential operator
ER  -