Cazals, Catherine, Florens, Jean-Pierre and Soteri, Soterios (2005) Delivery Costs for Postal Services in the UK: Some Results on Scale Economies with Panel Data. 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. 203-212. ISBN 978-0-387-23637-7