TY  - BOOK
AU  - Kippenhahn, Rudolf  .
TI  - Code breaking: a history and exploration / 
SN  - 81-7371-204-2
U1  - BV 
PY  - 2000///
CY  - Hyderbad : 
PB  - Universities Press(India) Ltd. , 
KW  - Computer- Code Breaking
ER  -