Boyce, William E. <br/><br/>
Elementary differential equations / 
William E. Boyce and Richard C. DiPrima 
 - 2nd ed. 
 - New York :  John Wiley & Sons,  1969 
 - 421 p. :  ill. ;  24 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations