Skowron A,Vanderpooten D.A Generalized Definition of Rough Approximations Based on Similarity.IEEE Trans on Knowledge and Data Engineering,2000,12(2): 331-336
[6]
Li Jinjin.Topological Methods on the Theory of Covering Generalized Rough Sets.Pattern Recognition and Artificial Intelligence,2004,17(1): 7-10 (in Chinese)(李进金.覆盖广义粗集理论中的拓扑学方法.模式识别与人工智能,2004,17(1): 7-10)
[7]
Yao Y Y.Constructive and Algebraic Methods of the Theory of Rough Sets.Journal of Information Sciences,1998,109(1/2/3/4): 21-47
[8]
Yao Y Y.Two Views of the Theory of Rough Sets in Finite Universes.International Journal of Approximate Reasoning,1996,15(4): 291-317