Cremer, Helmuth, Roy, Bernard, Toledano, Joëlle and de Villemeur, Étienne (2005) Worksharing, Pricing and Competition in the Postal Sector. In: Regulatory and Economics Challenges in the Postal and Delivery Sector Crew, Michael A. and Kleindorfer, Paul R. (eds.) Springer. Series “Topics in Regulatory Economics and Policy” pp. 139-161. ISBN 978-0-387-23637-7

Cremer, Helmuth, Roy, Bernard, Toledano, Joëlle and de Villemeur, Étienne (2004) Access and (Non-)Uniform Pricing in the Postal Sector. In: Competitive Transformation of the Postal and Delivery Sector Crew, Michael A. and Kleindorfer, Paul R. (eds.) Springer. Series “Topics in Regulatory Economics and Policy”, Vol. 46. Chapter 2. pp. 43-68. ISBN 978-1-4419-8915-4

Cremer, Helmuth, Roy, Bernard, Toledano, Joëlle and de Villemeur, Étienne (2002) Pricing and Worksharing Discounts in the Postal Sector. In: Postal and Delivery Services: Delivering on Competition Crew, Michael A. and Kleindorfer, Paul R. (eds.) Springer. Series “Topics in Regulatory Economics and Policy”, Vol. 44. pp. 33-48. ISBN 978-1-4615-0233-3