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IEEE Transactions on Learning Technologies > 2015 > 8 > 1 > 43 - 54
2011 15th Panhellenic Conference on Informatics > 338 - 344
IEEE Transactions on Learning Technologies > 2015 > 8 > 1 > 43 - 54
2011 15th Panhellenic Conference on Informatics > 338 - 344