1. Rough sets;Pawlak;International Journal of Computer and Information Science,1982
2. Approximation operators in qualitative data analysis;Düntsch,2003
3. G. Gediga, I. Düntsch, Modal-style operators in qualitative data analysis, in: Proc. IEEE Int. Conf. on Data Mining, 2002, pp. 155–162.
4. A multiview approach for intelligent data analysis based on data operators;Chen;Information Sciences,2008
5. A comparative study of formal concept analysis and rough set theory in data analysis;Yao;Lecture Notes in Artificial Intelligence,2004