TY  - BOOK
AU  - Gupta, Prem Kumar
AU  - Hira , D.S
TI  - Problems in operation research: principles and solutions
SN  - 9788121909686
U1  - 658.4034 
PY  - 2020///
CY  - New Delhi
PB  - S Chand
KW  - 
KW  - Operations research
N1  - 1st edition in 1991 and reprint in 2020
ER  -