Charnes, Cooper, Rhodes (1981) Evaluating Program and Managerial Efficiency: An Application of Data Envelopment Analysis to Program Follow Through. Management Science 27/26:668-697.
Deprins Estimation de frontières de production et mesures de l'afficacité technique, CIACO, Louvainla-Neuve; 1989.
Gathon (1991) La performance des chemins de fer européens. Gestion et autonomie. Ph.D. Dissertation, Université de Lìege; .
Gathon, Perelman (1992) Measuring technical efficiency in European railways: A panel data approach. Journal of Productivity Analysis 3:135-151.
Greene (1980) Maximum likelihood estimation of econometric frontier functions. Journal of Econometrics 13:27-56.
Hart (1983) The Market Mechanism as an Incentive Scheme. The Bell Journal of Economics 14:366-382.
Klein A Textbook of Econometrics, Row Peterson, New York; 1953.
Nishimizu, Page (1982) Total factor productivity growth, technological progress and technical efficiency change: Dimensions of productivity change in Yugoslavia 1965–1978. The Economic Journal 92:920-936.
Perelman, Pestieau (1988) Technical performance in public enterprises: A comparative study of railways and postal services. European Economic Review 32:432-441.
Pestieau, Tulkens (1993) Assessing and explaining the performance of public sector activities: Some recent evidence from the productive efficiency point of view. Finanz Archiv 50-53:293-323.
Oum, Yu Economic efficiency of passenger railway systems and implications on public policy, Mimeo; 1991.
Vickers, Yarrow Privatization, An Economic Analysis, MIT Press, Cambridge, MA; 1988.
Yarrow (1986) Privatization in Theory and Practice. Economic Policy 1:324-377.