R. Klamma, und C. Haasler. Proceedings of I-KNOW '08 and I-MEDIA '08, Seite 276--279. Know-Center, Graz, Journal of Universal Computer Science, (September 2008)
F. Ortega, J. Gonzalez-Barahona, und G. Robles. HICSS '08: Proceedings of the Proceedings of the 41st Annual Hawaii International Conference on System Sciences, Seite 304. Washington, DC, USA, IEEE Computer Society, (2008)
H. Halpin, V. Robu, und H. Shepherd. WWW '07: Proceedings of the 16th international conference on World Wide Web, Seite 211--220. New York, NY, USA, ACM, (2007)