Holvad T, JL Hougaard, D Kronborg and HK Kvist (2004). “Measuring Inefficiency in the Norwegian Bus Industry Using Multi-Directional Efficiency Analysis.” Transportation 31(3): 349-369.

Holvad T, JL Hougaard, D Kronborg and HK Kvist (2004). “Measuring Inefficiency in the Norwegian Bus Industry Using Multi-Directional Efficiency Analysis.” Transportation 31(3): 349-369.

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