Barnum D, JM Gleason and DT Barnum (1982). “Toward Valid Measures of Public Sector Productivity: Performance Indicators in Urban Transit.” Management Science 28 (4): 379-386.

Barnum D, JM Gleason and DT Barnum (1982). “Toward Valid Measures of Public Sector Productivity: Performance Indicators in Urban Transit.” Management Science 28 (4): 379-386.

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