Ali Emrouznejad's Data Envelopment Analysis
Amin, G. R. and A. Emrouzejad (2011). “Some clarifications on the DEA clustering approach.” European Journal of Operational Research 215: 498?501.
Adler N and B Golany (2002). “Including Principal Component Weights to Improve Discrimination in Data Envelopment Analysis.” JORS 53(9): 985-991.