TY  - BOOK
AU  - Fraenkel, L. E
TI  - An introduction to maximum principles and symmetry in elliptic problems
SN  - 9780521461955
U1  - 515.3533 FRA 
PY  - 2008///
CY  - Cambridge
PB  - Cambridge Univeristy Press
KW  - Differential equations, Elliptic
ER  -