Banker RD, HS Chang and WW Cooper (2002). “‘Small Sample Properties of ML, COLS and DEA Estimators of Frontier Models in the Presence of Heteroscedasticity’ by A.N. Bojanic, S.B. Caudill and J.M. Ford, EJOR 108, 1998, 140-148: A Comment [and Author’s Reply].” EJOR 136(2): 466-469.

Banker RD, HS Chang and WW Cooper (2002). “‘Small Sample Properties of ML, COLS and DEA Estimators of Frontier Models in the Presence of Heteroscedasticity’ by A.N. Bojanic, S.B. Caudill and J.M. Ford, EJOR 108, 1998, 140-148: A Comment [and Author’s Reply].” EJOR 136(2): 466-469.

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