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Morishita, T., Niimura, M. & Kunimune, H. (2010). Historical Characteristics of Education Portfolio Research from Keywords of Research Papers in ERIC. In J. Sanchez & K. Zhang (Eds.), Proceedings of E-Learn 2010--World Conference on E-Learning in Corporate, Government, Healthcare, and Higher Education (pp. 2040-2045). Orlando, Florida, USA: Association for the Advancement of Computing in Education (AACE).