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IEEE Transactions on Learning Technologies > 2015 > 8 > 2 > 158 - 172
IEEE Transactions on Software Engineering > 2011 > 37 > 3 > 325 - 340
IEEE Transactions on Learning Technologies > 2015 > 8 > 2 > 158 - 172
IEEE Transactions on Software Engineering > 2011 > 37 > 3 > 325 - 340