Cremer, Helmuth, De Donder, Philippe, Dudley, Paul and Rodriguez, Frank (2008) Pricing, Welfare and Organisational Constraints for Postal Operators (part III). In: Competition and Regulation in the Postal and Delivery Sector Crew, Michael A. and Kleindorfer, Paul R. (eds.) Edward Elgar Publishing. Chapter 11. pp. 150-166.