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IEEE Transactions on Knowledge and Data Engineering > 2011 > 23 > 6 > 875 - 888
2010 IEEE Frontiers in Education Conference (FIE) > F3G-1 - F3G-2
2010 2nd International Conference on Software Technology and Engineering > 1 > V1-194 - V1-201
IT Professional > 2009 > 11 > 5 > 17 - 21