Boyce, William E. <br/><br/>
Elementary differential equations / 
William E. Boyce and Richard C. DiPrima 
 - 3rd ed. 
 - New York :  John Wiley & Sons,  1977 
 - vii, 496 p. :  ill. ;  23 cm. 
<br/><br/><label>ISBN: </label>0471093394 
<br/><br/><label>LCCN: </label>75-035565 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations