TY  - BOOK
AU  - Cooper,S.Barry
AU  - Leeuwen,J.van
TI  - Alan Turing: his work and impact 
SN  - 9780123869807
PY  - 2013///
CY  - Waltham, MA
PB  - Elsevier
KW  - Computer science
KW  - Mathematics
KW  - Enigma cipher system
KW  - Logic, Symbolic and mathematical
N1  - Includes bibliographical references and index
ER  -