ETGEN, Garret J. <br/><br/>
An Introduction to ordinary differential equations : with difference equations, 

 - New York  Happer & Row pub  1977 
 - x, 517 p. 
<br/><br/><label>ISBN: </label>006041913X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations
<br/><br/><label>Dewey Class. No.: </label>515.35  / ETG