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2010 2nd International Conference on Education Technology and Computer > 1 > V1-586 - V1-591
2009 Fourth Balkan Conference in Informatics > 163 - 168
IEEE Transactions on Education > 2009 > 52 > 4 > 538 - 546
IEEE Transactions on Education > 2007 > 50 > 4 > 292 - 301