TY  - BOOK
AU  - Gupta, Prem Kumar
AU  - Hira, D.S.
TI  - Operations research
SN  - 8121902819
U1  - 658.403 4 
PY  - 2002///
CY  - New Delhi
PB  - S. Chand & company
KW  - Operation research
ER  -