Boyce, William E. <br/><br/>
Elementary differential equations / 

 - 8th ed. 
 - Hoboken  John Wiley,  2004. 
 - xviii, 622 p. :  ill. ;  26 cm. + 
<br/><br/>Includes index. 
<br/><br/><label>ISBN: </label>047143339X  
<br/><br/><label>LC Class. No.: </label>QA371  / .B71 2004