TY  - BOOK
AU  - Gupta, Prem Kumar and Hira, D.S 
TI  - Operations research 
SN  - 9788121902816
U1  - 003 GUP  
PY  - 2016///
CY  - S. Chand and company Ltd. 
PB  - New Delhi 
KW  - Operations research
ER  -