1. 21Net, 2007. Thalys selects Nokia Siemens Networks, 21Net and Telenet to Implement Broadband Internet. Access on Board its High Speed Trains. Consulted online: .
2. An analysis of consumer preferences among wireless LAN and mobile Internet services;Ahn;ETRI Journal,2006
3. Radio over Fiber Technologies for Mobile Communications Networks;Al-Raweshidy,2002
4. Sales forecasts for existing consumer products and services: do purchase intentions contribute to accuracy?;Armstrong;International Journal of Forecasting,2000
5. Business models for next-generation wireless services;Ballon;Trends in Communications,2002