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Keppell, M. (2005). Reusable media-rich problem-based learning cases: Creating learning objects for teacher-education. In P. Kommers & G. Richards (Eds.), Proceedings of ED-MEDIA 2005--World Conference on Educational Multimedia, Hypermedia & Telecommunications (pp. 1865-1873). Montreal, Canada: Association for the Advancement of Computing in Education (AACE).