Cremer, Helmuth, De Donder, Philippe, Dudley, Paul and Rodriguez, Frank (2013) Welfare and Pricing with Single-Piece and Bulk Mail Access Competition in the Postal Sector. In: Reforming the Postal Sector in the Face of Electronic Competition Edward Elgar Publishing. Chapter 25. ISBN 978 0 85793 579 3

Borsenberger, Claire, Cremer, Helmuth, De Donder, Philippe, Joram, Denis and Lecou, Sébastien (2013) Segmentation and Nonlinear Pricing in the Postal Sector. In: Reforming the Postal Sector in the Face of Electronic Competition Edward Elgar Publishing. Chapter 7. ISBN 978 0 85793 579 3