TY  - BOOK
AU  - Gupta, Prem Kumar.
AU  - Hira, D.S.
TI  - Operations research
SN  - 8121902819
U1  - 658.409 GUP 
PY  - 1979///
CY  - New Delhi
PB  - S.Chand and Company Ltd
N1  - Includes index
ER  -