1. Agarwal, S., Lorch, J.R.: Matchmaking for online games and other latency-sensitive P2P systems. ACM SIGCOMM Comput. Commun. Rev. 39, 315 (2009)
2. Albert, D., Lukas, J.: Knowledge Spaces: Theories, Empirical Research, and Applications. Psychology Press, Hove (1999)
3. Alexander, L.: Ian Bogost’s Troubling Experiences With Cow Clicker (2010). http://www.gamasutra.com/view/news/30835/GDC_Online_Ian_Bogosts_Troubling_Experiences_With_Cow_Clicker.php
4. Bogost, I.: Cow Clicker - The Making of Obsession (2010). http://www.bogost.com/blog/cow_clicker_1.shtml
5. Bonsignore, E., Kraus, K., June, A., Amanda, V., Fraistat, A., Druin, A.: Alternate reality games: platforms for collaborative learning. In: Proceedings of the Tenth International Conference of the Learning Sciences. International Society of the Learning Sciences, Sydney (2012)