Charnes A and SX Li (1989). “Using Data Envelopment Analysis to Evaluate Efficiency in the Economic Performance of Chinese Cities.” Socio-Econ Plan Sci 23: 325-344.
Charnes A and SX Li (1989). “Using Data Envelopment Analysis to Evaluate Efficiency in the Economic Performance of Chinese Cities.” Socio-Econ Plan Sci 23: 325-344.