7Berger A N, Humphrey D B. Efficiency of financial institutions : international survey and directions for future research [ J ]. European Journal of Operational Research, 1997, 98 : 175-212.
8Charnes Cooper W W, Rhodes E. Measuring the efficiency of decision making units[ J]. European Journal of Operation Research, 1978, 2(6) : 429-444.
9Cooper W W, Seiford L M, Tone K. Data envelopment analysis[ M]. Boston: Kluve Academic Publichers, 2000.
10Malmquist S. Index number and indifference surface[J]. Trabajos de Estatistica, 1953, (4) : 209-242.