TY  - BOOK
AU  - W E Williams 
AU  - Williams, W E 
TI  - Partial Differential Equations 
SN  - 0198596332 
U1  - 515.353 WIL  
PY  - 1980///
CY  - Oxford
PB  - Clarendon
KW  -  
KW  - Mathematics 
ER  -