Levy, H & Lessman, F <br/><br/>
Finite difference equations 
H. Levy & F. Lessman 
 - New York  Dover Publications  1992 
 - vii  278 
<br/><br/><label>ISBN: </label>9780486672601 
<br/><br/><label>Dewey Class. No.: </label>11.02  / LEVY