TY  - BOOK
AU  - Boyce, William E..
TI  - Elementary differential equations and boudary value problems / 
SN  - 0-471-08955-9
U1  - B33 
PY  - 1997///
CY  - New York : 
PB  - John Wiley & Sons, Inc. , 
KW  - Differential equations
ER  -