Cooper, S. Barry <br/><br/>
Alan Turing :  his work and impact / 
S. Barry Cooper, J. van Leeuwen 
 - Waltham, MA :  Elsevier,  c2013 
 - xxi, 914 p. :  ill. ;  28 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>9780123869807 0123869803 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computer science--Mathematics<br/>Enigma cipher system<br/>Logic, Symbolic and mathematical