Cazals, Catherine, Fève, Frédérique, Florens, Jean-Pierre and Roy, Bernard (2005) Delivery Costs II: Back to Parametric Models. In: Regulatory and Economics Challenges in the Postal and Delivery Sector Crew, Michael A. and Kleindorfer, Paul R. (eds.) Springer US. Series “Topics in Regulatory Economics and Policy” pp. 189-202. ISBN 978-0-387-23637-7