6CHARNES A, COOPER W W, RHODES E. Measuring the efficiency of decision making units [J]. European Journal of Operational Research, 1978(2): 429-444.
7CHARNES A, COOPER W W, LI S. Using data envelopment analysis to evaluate efficiency in the economic performance of Chinese cities [J]. Socio-Economic Planning Sciences, 1989(23): 325-344.
8MILAN M, GORDANA S. An application of DEA for comparative analysis and ranking of regions in Serbia with regards to social-economic development [J]. European Journal of Operational Research, 2001(132): 343-356.