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Personal and Ubiquitous Computing > 2011 > 15 > 5 > 497-509
International Journal of Technology and Design Education > 2009 > 19 > 1 > 67-77
Personal and Ubiquitous Computing > 2011 > 15 > 5 > 497-509
International Journal of Technology and Design Education > 2009 > 19 > 1 > 67-77