1. Berndt ER, Pindyck RS, Azoulay P (2003) Network effects and diffusion in pharmaceutical markets: antiulcer drugs. J Ind Econ 51(2):243–270
2. Birke D, Swann GMP (2005) Social networks and choice of mobile phone operator. Nottingham University Business School, Industrial Economics Division Occasional Paper Series, No. 2005–14
3. Brynin M (2002) Home OnLine, 1998–2001 [computer file]. Colchester, Essex, UK Data Archive [distributor], SN: 4607
4. Competition Commission (2003): Vodafone, O2, Orange and T-Mobile: reports on references under section 13 of the Telecommunications Act 1984 on the charges made by Vodafone, O2, Orange and T-Mobile for terminating calls from fixed and mobile networks. Available at: http://www.competition-commission.org.uk/rep_pub/reports/2003/475mobilephones.htm (Accessed 14-06-05)
5. Doganoglu T, Grzybowski L (2004) Diffusion of mobile telecommunication services in Germany: a network effects approach. Munich: Ludwig Maximilian University, Available at: http://www.lrz-muenchen.de/∼grzybowski/de-mobiles.pdf (Accessed 14-06-05)