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IEEE Software > 2013 > 30 > 6 > 33 - 39
IEEE Transactions on Software Engineering > 2013 > 39 > 8 > 1054 - 1068
IEEE Transactions on Learning Technologies > 2013 > 6 > 3 > 217 - 227
2012 19th Asia-Pacific Software Engineering Conference > 1 > 808 - 817
2012 16th Panhellenic Conference on Informatics > 387 - 392