TY  - BOOK
AU  - Etgen,Garret J.
AU  - Etgen,Garret J.
AU  - Morris,William L.
TI  - Introduction to ordinary differential equations: with difference equations, numerical methods, and applications 
SN  - 006041913X
PY  - 1977///
CY  - New York
PB  - Harper & Row
KW  - Differential equations
KW  - Difference equations
N1  - Includes index
ER  -