Catherine Cazals, Jean-Pierre Florens, Séverine Rouzaud, and Marc de Rycke, “Scale Economies and Natural Monopoly in the Postal Delivery: Comparison between Parametric and Non Parametric Specifications”, in Managing Change in the Postal and Delivery Industries, Michael A. Crew, and Paul R. Kleindorfer (eds.), Kluwer, series “Topics in Regulatory Economics and Policy”, vol. 25, chapter 4, 1997, pp. 65–82.
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IDEI Working Paper, n. 58, 1996