TY  - GEN
AU  - Hansen ,  Per Brinch
TI  - Operating system principles
SN  - 0876921357
U1  - 005.43 
PY  - 1990///
CY  - New Delhi
PB  - Prentice Hall
KW  - SYSTEM SOFTWARE
KW  - COMPUTER SCIENCE
KW  - OS
KW  - OPERATING SYSTEM
ER  -