Coelli, T., & Perelman, S. (1996). Efficiency measurement, multiple-output technologie and distance functions: With application to European Railways. (DP 1996/05). Liège, Belgium: CREPP. https://orbi.uliege.be/handle/2268/35665 https://hdl.handle.net/2268/35665
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Coelli, T., & Perelman, S. (1999). A comparison of parametric and non-parametric distance functions: with application to European Railways. European Journal of Operational Research, (117), 326-339. doi:10.1016/S0377-2217(98)00271-9 https://hdl.handle.net/2268/9156