Kelley, Walter G. <br/><br/>
Difference equations, second edition :  an introduction with applications / 
Walter G. Kelley, Allan C. Peterson. 
 - 2nd ed. 
 - [S.l.] :  Academic Press,  2000. 
 - 403 p. ;  25 cm. 
<br/><br/><label>ISBN: </label>012403330X 9780124033306 
<br/><br/><label>Dewey Class. No.: </label>515.625