TY  - BOOK
AU  - Ray, Subhash C  .
TI  - Data envelopment analysis: theory and techniques for economics and operations research / 
SN  - 0-521-80256-3
U1  - X 
PY  - 2004///
CY  - Cambridge : 
PB  - Cambridge University Press , 
KW  - Production(Economic theory)
ER  -