TY  - BOOK
AU  - Sewell M J
TI  - Maximum and minimum principles: A unified approach   
T2  - Cambridge Texts in Applied Mathematics
U1  - B37:7, M7 
PY  - 1987///
CY  - London
PB  - Cambridge University Press        
KW  - Real Variable
N1  - Bibliography:  P 444-460
ER  -