1. Broll W, Ohlenburg J, Lindt I, Herbst I, Braun AK (2006) Meeting Technology Challenges of Pervasive Augmented Reality Games. In: Proceedings of ACM Netgames, Singapore, Oct. 30–31, 2006.
2. Čišić D, Tijan E (2008) D 6.4. Final test report, mGBL Project Report [online]. Available at: http://www.mg-bl.com
3. Ferstl OK, Schmitz K (2001) Integrierte Lernumgebungen für virtuelle Hochschulen (Integrated Learning Environments for Virtual Universities). In: Wirtschaftsinformatik 43 (1), pp 13–22
4. Glu Mobile (2006) Glu Challenges Mobile Myths with New Consumer Survey [online]. Available at: http://www.glu.com/about/press.php?press=100106b [accessed 10 March 2008]
5. INTEGRAL (2007) Austrian Internet Monitor, Kommunikation und IT in Österreich, 2. Quartal 2007 (Communication and IT in Austria, Q2 2007) [online]. Available at: http://www.integral.co.at/dImages/AIM_Consumer_Q2_2007.pdf [accessed 3 March 2008]