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IEEE Transactions on Knowledge and Data Engineering > 2017 > 29 > 12 > 2655 - 2668
IEEE Intelligent Systems > 2012 > 27 > 5 > 36 - 43
2010 International Conference on Educational and Information Technology > 1 > V1-162 - V1-166
Proceedings of the IEEE > 2010 > 98 > 8 > 1485 - 1508