TY  - BOOK
AU  - Gupta, P. K.
AU  - Hira D. S.
TI  - Operations research
SN  - 9788121902816
AV  - T57.6.A2.G86 2019 
PY  - 2019///
CY  - New Delhi
PB  - S Chand and company
KW  - Operation research
ER  -