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)
V. Gómez, A. Kaltenbrunner, und V. López. WWW '08: Proceeding of the 17th international conference on World Wide Web, Seite 645--654. New York, NY, USA, ACM, (2008)