1. ITU Internet Reports 2002: Internet for a Mobile Generation, International Telecommunication Union (September 2002) http://www.itu.int/osg/spu/publications/sales/mobileinternet/
2. Mobile and internet penetration rates increase 08/08/2002, http://www.europemedia.net/
3. eEurope Benchmarking Report, European Commission, http://europa.eu.int/information_society/eeurope/benchmarking/index_en.htm
4. eTForecasts, Internet Users Will Surpass 1 Billion in 2005, http://www.etforecasts.com/pr/pr201.htm
5. Niebert, N.: Convergence of Cellular and Broadband Networks towards Future Wireless Generations. In: Wireless Strategic Initiative (WSI) Book of Visions 2000 - Visions of the Wireless World Workshop, Brussels (2000)