De Donder, Philippe, Soteri, Soterios and Rodriguez, Frank (2017) An Examination of the Links Between Postal Price Constraints, Efficiency, Competition and Public Welfare. In: Changing Postal and Delivery Sector: Towards A Renaissance Brennan, Timothy J., Crew, Michael A. and Parcu, Pier Luigi (eds.) Edward Elgar Publishing. Series “Topics in Regulatory Economics and Policy” Chapter 4. pp. 51-66. ISBN 9783319460468