3PAWLAK Z, GRZYMALA - BUSSE J, SLOWINSKI R, et al. Rough sets [ J ]. Communications of the ACM, 1995,38 ( 11 ) : 88 - 95.
4FAYYAD U, PIATETSKY- SHAPIRO G, SMYTH P. The KDD process for extracting useful knowledge from volumes of data[ J]. Communications of the ACM, 1996,39 ( 11 ) :27 - 34.