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IEEE Transactions on Software Engineering > 2010 > 36 > 2 > 184 - 197
IEEE Transactions on Learning Technologies > 2008 > 1 > 4 > 215 - 228
IEEE Transactions on Software Engineering > 2010 > 36 > 2 > 184 - 197
IEEE Transactions on Learning Technologies > 2008 > 1 > 4 > 215 - 228