TY  - BOOK
AU  - Simmons, George F. , Krantz, Steven G. 
TI  - Differential equation : theory, technique, and practice
SN  - 007-125437-4
U1  - Cir. 515.35 Si5 
PY  - 2007///
CY  - Boston : 
PB  - McGraw- Hill
ER  -