TY  - BOOK
AU  - O'Shea,G.
TI  - Security in computer operating systems
SN  - 0850128129
U1  - QA/76.9.A25 
PY  - 1991///
CY  - Oxford
PB  - NCC Blackwell Limited
KW  - Computers -- Access control.
KW  - Data protection.
KW  - Operating systems (Computers).
ER  -