1. Some Models for Estimating Technical and Scale Inefficiencies in Data Envelopment Analysis
2. Barger H (1951)The Transportation Industries 1889 to 1946: A Study of Output, Employment and Productivity(New York, NY: National Bureau of Economic Research)
3. Boame AK (2001) The sources of efficiency change in the Canadian urban transit systems: a data envelopment analysis (DEA) approach Unpublished PhD dissertation, Department of Economics, University of Manitoba