1[1]CHANES,A.,www.COOPER,and BHODS.E.Measuring the efficiency of decision making units.Eur.J.of Opnl.Res.,pp.252-67,1978
2[2]Charnes A,W.W.Cooper Golany B et al,Foundatmns of data envdopment analysis for Pareto-Koopmans efficient empirical production functions,Journal of Econometrics 20(1/2)pp.91-107,1985