TY  - BOOK
AU  - Gupta, Prem Kumar 
AU  - Hira, D.S. 
TI  - Problems in operations research: (principles and solutions)
SN  - 9788121909686
U1  - 003 G9592p 
PY  - 1991///
CY  - New Delhi
PB  - S. Chand & Company Ltd.
KW  - Operations research
ER  -