TY  - BOOK
AU  -  Gupta,P.K.
AU  - Hira,D.S.
TI  - Problems in operations research:  principles and solutions / 
SN  - 8121909686. 
U1  - 658.5076 
PY  - 2001///
CY  - New Delhi : 
PB  - S. Chand, 
KW  -  Operations research
ER  -