1. Armstrong, M. (2008). Access pricing, bypass and universal service in post. Review of Network Economics, 7, 172–187.
2. Boldron, F., Borsenberger, C., Joram, D., Lécou, S., & Roy, B. (2009). A dynamic and endogenous approach to financing the USO in a liberalized environment. In M. Crew & P. Kleindorfer (Eds.), Progress in the competitive agenda in the postal and delivery sector (pp. 67–82). Cheltenham: Edward Elgar.
3. Boldron, F., Cremer, H., De Donder, P., Joram, D., & Roy, B. (2009). Network externalities and the USO: a two-sided market approach. In M. Crew & P. Kleindorfer (Eds.), Progress in the competitive agenda in the postal and delivery sector (pp. 184–195). Cheltenham: Edward Elgar.
4. Borsenberger, C., Joram, D., Magre, C., & Roy, B. (2010). Cross-country comparisons of optimal mail delivery frequency. In M. Crew & P. Kleindorfer (Eds.), Heightening competition in the postal and delivery sector (pp. 235–253). Cheltenham: Edward Elgar.
5. Brennan, T., & Crew, M. (2014). Gross substitutes versus marginal substitutes: implications for market definition in the postal sector. In M. Crew & T. Brennan (Eds.), The role of the postal and delivery sector in a digital age. Cheltenham: Edward Elgar.