TY  - BOOK
AU  -  	Prem Kumar Gupta
AU  - D S Hira
TI  - Operations Research
SN  - 9788121902816
U1  - 001.424 GUP-O 
PY  - 1999///
CY  -  	Ram Nagar, New Delhi 
PB  - S. Chand & Company Ltd
KW  -  	      Operations research.
ER  -