6Banker,R. D. ,A. Charnesand W. W. Cooper, (1984),"Some Models for Estimating Technical and Scale Inefficiencies in Data Envelopment Analysis",Management Sciences,Vol. 30,pp. 1078-1092.
7Charnes ,A. ,Cooper,W. W. and E. Thanassoulis, (1978) ,"Measuring the Efficiency of Decision Making Units",European Journal of Operational Research 2(6),p429-444.
8Farrell, M. J. , (1957), "The Measurement of Productive Efficiency", Journal of the Royal Statistical Society,A120,pp. 499-513.
9Michael, N. and S. Barry, (1991 ), "Data Envelopment Analysis", Review of Economics And Statistics, 62(2) ,pp. 318-321.