1. Jafarkhani, H.: Space-Time Coding: Theory and Practice. Cambridge Uni. Press, Cambridge (2005)
2. Gabriel, C.: A Global View of Pre-WiMAX Deployment, from: Wimax Trends: The Net’s Leading Resource for WiMAX Technology & Solutions (2005) (accessed: 03-03-2006), source: http://www.wimaxtrends.com/articles/excerpt/e101005a.htm
3. The FON project: WiFi Everywhere (Accessed: 03-03-2006), Source: http://en.fon.com/
4. Computer Business Review Online, T-Mobile first to bridge 3G, EDGE, GPRS,and WiFi, March 13 (2006) (accessed: 04-04-2006), source: http://www.cbronline.com/article_news.asp?guid=C0AB6620-5C75-49A9-95B9-0F30F14C3884
5. Cushnie, J., Hutchinson, D., Oliver, H.: Evolution of Charging and Billing Models for GSM and Future Mobile Internet Services. In: QofIS 2000: Proceedings of the First COST 263 International Workshop on Quality of Future Internet Services, London, UK (2000)