TY  - BOOK
AU  - Protter,M.H & Wein-Berger,H.F
ED  - Wein-Berger, H.F
TI  - Maximum principles in differential equations
T2  - Prentice-hall partial differential equations series
SN  - 3540960686
U1  - 10.02 
PY  - 1967///
CY  - New York
PB  - Springer
ER  -