TY  - BOOK
AU  - Gupta, Prem Kumar
AU  - Hira, D. S.
TI  - Operations research
SN  - 9788121902816
U1  - 658.5  GUP-O 
PY  - 2011///
CY  - Delhi
PB  - S Chand
KW  - Operations research
ER  -