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Verbert, K. & Duval, E. (2004). Towards a Global Architecture for Learning Objects: A Comparative Analysis of Learning Object Content Models. In L. Cantoni & C. McLoughlin (Eds.), Proceedings of ED-MEDIA 2004--World Conference on Educational Multimedia, Hypermedia & Telecommunications (pp. 202-208). Lugano, Switzerland: Association for the Advancement of Computing in Education (AACE).