1. AOL, 2000. Letter from AOL/Time Warner to the FCC concerning IM, dated September 29, 2000. http://www.fcc.gov/mb/aoltw/aoltw.html.
2. Armstrong, M., 2005. Competition in two-sided markets, mimeo. University College London.
3. Competitive price discrimination;Armstrong;RAND Journal of Economics,2001
4. Bayer, R., Chan, M., 2004. Network externalities, demand inertia, and dynamic pricing in an experimental oligopoly market, mimeo. University of Adelaide.
5. Chicken and egg: competition among intermediation service providers;Caillaud;RAND Journal of Economics,2003