IEEE Transactions on Knowledge and Data Engineering
IEEE Transactions on Knowledge and Data Engineering > 2009 > 21 > 2 > 206 - 219
IEEE Transactions on Knowledge and Data Engineering > 2009 > 21 > 11 > 1643 - 1647
IEEE Transactions on Knowledge and Data Engineering > 2009 > 21 > 12 > 1767 - 1782