Kelley, Walter G. <br/><br/>
The theory of differential equations :  classical and qualitative / 
Walter G. Kelley, Allan C. Peterson. 
 - 2nd ed. 2010. 
 - [S.l.] :  Springer,  2010. 
 - 436 p. ;  24 cm. 
 - Universitext. .
 - Universitext. .
<br/><br/><label>ISBN: </label>1441957820 9781441957825 
<br/><br/><label>Dewey Class. No.: </label>515.35