Bojanic AN, SB Caudill and JM Ford (1998). “Small-Sample Properties of Ml, Cols, and DEA Estimators of Frontier Models in the Presence of Heteroscedasticity.” EJOR 108(1): 140-148.
Bojanic AN, SB Caudill and JM Ford (1998). “Small-Sample Properties of Ml, Cols, and DEA Estimators of Frontier Models in the Presence of Heteroscedasticity.” EJOR 108(1): 140-148.