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van Zyl, H. & Paist, E. (2008). How Do We Know Our Students Are Who They Say They Are?. In J. Luca & E. Weippl (Eds.), Proceedings of ED-MEDIA 2008--World Conference on Educational Multimedia, Hypermedia & Telecommunications (pp. 883-886). Vienna, Austria: Association for the Advancement of Computing in Education (AACE).