TY  - BOOK
AU  - Gupta,Prem Kumar
AU  - Hira,D .S
TI  - Operations research: an introduction
SN  - 8121908219
U1  - 658.4034 
PY  - 1987///
CY  - New Delhi
PB  - S Chand Comp..
KW  - Operations research
N1  - Include Appendix and index
ER  -