Boyce, William E. <br/><br/>
Elementary differential equations and boundary value problems / 
William E. Boyce, Richard C. DiPrima 
 - 3rd ed. 
 - New York:  Wiley,  1977 
 - 1 v. (various pagings) ;  23 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>0471093343 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations<br/>Boundary value problems