TY  - BOOK
AU  - GILBARG David
AU  -  TRUDINGER Neil S
TI  - Elliptic partial differential equations fo second order
T2  - Classics in Mathematics
SN  - 3540411607
U1  - B334, P1 
PY  - 2001///
CY  - Berlin
PB  - Springer-Verlag          
KW  - Economics
N1  - Bibliography: P491-506
ER  -