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Kolås, L. (2006). Topic maps in E-learning: An Ontology Ensuring an Active Student Role as Producer. In T. Reeves & S. Yamashita (Eds.), Proceedings of E-Learn 2006--World Conference on E-Learning in Corporate, Government, Healthcare, and Higher Education (pp. 2107-2113). Honolulu, Hawaii, USA: Association for the Advancement of Computing in Education (AACE).