TY  - BOOK
AU  -  Schaefer P.W 
TI  - Maximum Principles and Eigenvalue problems in partial differential equations
SN  - 0-582-01766-1
U1  - 515.353 
PY  - 1988///
CY  - New York
PB  - Longman Scientific
KW  - Differential Equations
KW  - Maximum Principles
ER  -