TY  - BOOK
AU  - Gupta, Prem Kumar 
AU  -  Hira, D. S.
TI  - Problems in operations research: Principles and solutions 
SN  - 8121909696
U1  - 003 22
PY  - 1991///
CY  - New delhi
PB  - S. Chand & co.
KW  - Operations research
N1  - New arrival 2014
ER  -