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IEEE Transactions on Education > 2011 > 54 > 2 > 273 - 278
2010 14th Panhellenic Conference on Informatics > 237 - 241
2010 2nd International Conference on Education Technology and Computer > 2 > V2-529 - V2-532
IEEE Transactions on Education > 2009 > 52 > 3 > 413 - 424
2008 38th Annual Frontiers in Education Conference > F1C-23 - F1C-26