TY  - BOOK
AU  - Hansen,Per Brinch  .
TI  - Operating system principles / 
SN  - 0876921357
U1  - 005.43 
PY  - 1973///
CY  - New Delhi : 
PB  - Prentice Hall , 
KW  - OPERATING SYSTEM
N1  - Includes bibliographical references and index
ER  -