Gathon HJ (1989). “Indicators of Partial Productivity and Technical Efficiency in the European Urban Transit Sector.” Annals of Public and Cooperative Economics 60(1): 43-59.

Gathon HJ (1989). “Indicators of Partial Productivity and Technical Efficiency in the European Urban Transit Sector.” Annals of Public and Cooperative Economics 60(1): 43-59.

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