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Coelli, T.J. and Perelman, S. (1996) Efficiency Measurement, Multi-Output Technologies and Distance Functions: With Application to European Railways. CreppWp 96/05. Centre de Recherche en Economie Publique Et Economie de la Population, Université de Liège, Liège.
http://orbi.ulg.be/bitstream/2268/35665/1/105.%20CREPP%209605%20Coelli-Perelman.pdf

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