Ross, Shepley L. <br/><br/>
Differential equations 

 - 3rd ed. 
 - New York  John Wiley & Sons  1984 
 - 807 p 
<br/><br/><label>ISBN: </label>0-471-81450-4 
<br/><br/><label>LC Class. No.: </label>QA 371 .R6/