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[6] 刘艳芳. Characteristic of partition-circuit matroid through approximation number[C]//Granular Computing (GrC), 2012 IEEE International Conference on. IEEE, 2012: 314-319.
[7] 刘艳芳. Matroidal structure of rough sets based on serial and transitive relations[J]. Journal of Applied Mathematics, 2012, 2012.