TY  - BOOK
T1  - Codes and cryptography
A1  - Welsh, D. J. A.
LA  - English
PP  - Oxford
PB  - Clarendon Press
YR  - 1988
UL  - https://ds.mainlib.upd.edu.ph/Record/UP-1685523046124979507
OP  - 257
CN  - Z 103 W46 1988
SN  - 0198532873
SN  - 0198532881
KW  - Ciphers.
KW  - Cryptography.
ER  -