7Liang Ji Ye,Xu Zong-Ben.The algorithm on knowledge reduction in incomplete information systems.International Journal of Uncertainty,Fuzziness and Knowledge Based Systems,2002,10(1):95～103
8Pawlak Z.et al.Rough set.Communications of the ACM,1995,38(11):89～95
9Pawlak Z.et al.Rough set theory and its application to data a nalysis.Cybernetics and Systems,1998,29(7):661～688
10Wang S.K.M.,Ziarko W..On optional decision rules in de cision table.Bulletin of Polish Academy of Sciences,1985,33(11～12):693～696
