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IEEE Transactions on Knowledge and Data Engineering > 2007 > 19 > 2 > 261 - 272
2010 International Conference on Educational and Information Technology > 3 > V3-461 - V3-463
IEEE Transactions on Knowledge and Data Engineering > 2007 > 19 > 2 > 261 - 272
2010 International Conference on Educational and Information Technology > 3 > V3-461 - V3-463