Tone K and WW Cooper (1997). “Measures of Inefficiency in Data Envelopment Analyis and Stochastic Frontier Estimation.” EJOR 99(1): 72-88.
Tone K and WW Cooper (1997). “Measures of Inefficiency in Data Envelopment Analyis and Stochastic Frontier Estimation.” EJOR 99(1): 72-88.