TY  - BOOK
AU  - Gupta, Prem Kumar
AU  - Hira, D.S.
TI  - Operations Research
SN  - 9788121902816
U1  - 003 21st ed.
PY  - 1979///
CY  - New Delhi
PB  - S. Chand & Company
N1  - Includes Index
ER  -