Chen, Zichun; Qin, Keyun Approximate assignment reduction in set-valued fuzzy decision information systems. (Chinese. English summary) Zbl 1240.68378 J. Sichuan Norm. Univ., Nat. Sci. 34, No. 1, 23-27 (2011). MSC: 68T37 68T30 03E72 PDFBibTeX XMLCite \textit{Z. Chen} and \textit{K. Qin}, J. Sichuan Norm. Univ., Nat. Sci. 34, No. 1, 23--27 (2011; Zbl 1240.68378) Full Text: DOI
Liu, Penghui; Chen, Zichun; Qin, Keyun Attribute reduction of set-valued information system based on maximal variable precision tolerance classes. (Chinese. English summary) Zbl 1212.68334 J. Sichuan Norm. Univ., Nat. Sci. 32, No. 5, 576-580 (2009). MSC: 68T37 68T30 68U35 PDFBibTeX XMLCite \textit{P. Liu} et al., J. Sichuan Norm. Univ., Nat. Sci. 32, No. 5, 576--580 (2009; Zbl 1212.68334)
Liu, Penghui; Chen, Zichun; Qin, Keyun A method of upper approximation and lower approximation fuzzy reasoning on complete residuated lattice. (Chinese. English summary) Zbl 1212.68333 J. Sichuan Norm. Univ., Nat. Sci. 32, No. 1, 43-46 (2009). MSC: 68T37 03B52 PDFBibTeX XMLCite \textit{P. Liu} et al., J. Sichuan Norm. Univ., Nat. Sci. 32, No. 1, 43--46 (2009; Zbl 1212.68333)
Chen, Zichun; Liu, Penghui; Qin, Keyun Topological properties of the covering fuzzy rough approximation operators. (Chinese. English summary) Zbl 1199.03039 J. Sichuan Norm. Univ., Nat. Sci. 31, No. 5, 526-529 (2008). MSC: 03E72 54A40 68T37 PDFBibTeX XMLCite \textit{Z. Chen} et al., J. Sichuan Norm. Univ., Nat. Sci. 31, No. 5, 526--529 (2008; Zbl 1199.03039)