TY  - BOOK
AU  - Gupta, Prem Kumar
AU  - Hira, D. S.
TI  - Problems in operations research: principles and solutions 
SN  - 9788121909686
U1  - 003 GUP 23
PY  - 2005///
CY  - New Delhi : 
PB  - S. Chand
KW  - Operations research
ER  -