Boyce, William E. <br/><br/>
Introduction to differential equations   
by William E.Boyce, Richard C.Diprima 
 - New York  John Wiley & Sons  1970 
 - xiii, 280p. 
<br/><br/><label>ISBN: </label>471 09338 6 
<br/><br/><label>LCCN: </label>72-96049 
<br/><br/><label>Dewey Class. No.: </label>515.35  / N702