TY  - BOOK
AU  - GUPTA PREM KUMAR, HIRA D. S.
TI  - OPERATION RESEARCH (7TH ED.)
SN  - 9788121902816
U1  - 658.403/GUP/HIR 
PY  - 2021///
CY  - NEW DELHI
PB  - S CHAND AND COMPANY LTD.
KW  - RESEARCH
ER  -