Helmuth Cremer, and Philippe De Donder, “Avantages et limites de la tarification non linéaire: le contrat commercial dans le secteur postal”, in Libéralisation & Services Publics: Economie postale, François Boldron, Claire Borsenberger, Denis Joram, Sébastien Lecou, and Bernard Roy (eds.), Economica, 2010, pp. 319–331.
François Boldron, Helmuth Cremer, Philippe De Donder, Denis Joram, and Bernard Roy, “Network Externalities and the Universal Service Obligation: A Two Sided Market Approach”, in Progress in the Competitive Agenda in the Postal and Delivery Sector, Michael A. Crew, and Paul R. Kleindorfer (eds.), Edward Elgar, 2009.
François Boldron, Helmuth Cremer, Bernard Roy, and Étienne de Villemeur, “Worksharing: A Calibrated Model”, The Review of Network Economics, vol. 7, n. 2, June 2008, pp. 272–293.
François Boldron, Helmuth Cremer, Philippe De Donder, Denis Joram, and Bernard Roy, “Social Costs and Benefits of the Universal Service Obligation in the Postal Market (part I)”, in Competition and Regulation in the Postal and Delivery Sector, Michael A. Crew, and Paul R. Kleindorfer (eds.), Edward Elgar Publishing, chapter 2, 2008, pp. 23–35.
Helmuth Cremer, Bernard Roy, Joëlle Toledano, and Étienne de Villemeur, “Worksharing, Access and Bypass: The Structure of Prices in the Postal Sector”, Journal of Regulatory Economics, vol. 32, n. 1, August 2007.
François Boldron, Helmuth Cremer, Bernard Roy, and Étienne de Villemeur, “Nonlinear Pricing and Worksharing in the Postal Sector”, in Liberalization of the Postal and Delivery Sector, Michael A. Crew, and Paul R. Kleindorfer (eds.), Edward Elgar Publishing, chapter 9, 2006.
Helmuth Cremer, Bernard Roy, Joëlle Toledano, and Étienne de Villemeur, “Worksharing, Pricing and Competition in the Postal Sector”, in Regulatory and Economics Challenges in the Postal and Delivery Sector, Michael A. Crew, and Paul R. Kleindorfer (eds.), Boston: Springer, series “Topics in Regulatory Economics and Policy”, 2005, pp. 139–161.
Catherine Cazals, Frédérique Fève, Jean-Pierre Florens, and Bernard Roy, “Delivery Costs II: Back to Parametric Models”, in Regulatory and Economics Challenges in the Postal and Delivery Sector, Michael A. Crew, and Paul R. Kleindorfer (eds.), Boston: Springer, series “Topics in Regulatory Economics and Policy”, 2005.
Helmuth Cremer, Bernard Roy, Joëlle Toledano, and Étienne de Villemeur, “Access and (Non) - Uniform Pricing in the Postal Sector”, in Competitive Transformation of the Postal and Delivery Sector, Michael A. Crew, and Paul R. Kleindorfer (eds.), Springer, series “Topics in Regulatory Economics and Policy”, vol. 46, chapter 2, 2004.
Helmuth Cremer, “Concurrence et service public dans le secteur postal”, in Concurrence et service public, Claude Henry, and Emile Quinet (eds.), Paris: L'Harmattan, 2004, pp. 339–352.