Sinkov, Abraham,  1907- <br/><br/>
Elementary cryptanalysis :  a mathematical approach / 
by Abraham Sinkov 
 - New York :  Random House,  1968 
 - ix, 189 p. ;  23 cm. 
 - New mathematical library ;  v. 22 .
 - New mathematical library ;  v. 22 .
<br/><br/>Bibliography : p. 184-186 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cryptography<br/>Ciphers