Sickles RC, DH Good and L Getachew (2002). “Specification of Distance Functions Using Semi- and Nonparametric Methods with an Application to the Dynamic Performance of Eastern and Western European Air Carriers.” JPA 17(1-2): 133-155.

Sickles RC, DH Good and L Getachew (2002). “Specification of Distance Functions Using Semi- and Nonparametric Methods with an Application to the Dynamic Performance of Eastern and Western European Air Carriers.” JPA 17(1-2): 133-155.

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