Beutelspacher, Albrecht. <br/><br/>
Cryptology   
by Albrecht Beutelspacher 
 -  Mathematical Assoc. of America  1994 
 - xvi, 156p. 
<br/><br/><label>ISBN: </label>0883855046 
<br/><br/><label>Dewey Class. No.: </label>005.82  / N941