Chang KP and PH Kao (1992). “The Relative Efficiency of Public Versus Private Municipal Bus Firms: An Application of Data Envelopment Analysis.” in Gulledge TR and CAK Lovell (eds.) International Applications of Productivity and Efficiency Analysis, Dordrecht, Kluwer Academic Publishers.

Chang KP and PH Kao (1992). “The Relative Efficiency of Public Versus Private Municipal Bus Firms: An Application of Data Envelopment Analysis.” in Gulledge TR and CAK Lovell (eds.) International Applications of Productivity and Efficiency Analysis, Dordrecht, Kluwer Academic Publishers.

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