Reference

Helmuth Cremer, André Grimaud, and Jean-Jacques Laffont, The Cost of Universal Service in the Postal Sector, in Current Directions in Postal Reform, Michael A. Crew, and Paul R. Kleindorfer (eds.), Kluwer Academic Publishers, series “Topics in Regulatory Economics and Policy, vol. 35, chapter 3, 2000, pp. 47–68.