Abell Martha L, <br/><br/>
Introductory diffential equations :  
by Abell nd Braselton .  
 - 3rd ed. 
 - Kidlington  Elsevier Ltd. 
 - 723P. 
<br/><br/><label>ISBN: </label>978-0-12-374935-2 
<br/><br/><label>Dewey Class. No.: </label>B321  / Q0