Ivo Düntsch, Günther Gediga. Approximation Operators in Qualitative Data Analysis. In Harrie C. M. de Swart, Ewa Orlowska, Gunther Schmidt, Marc Roubens, editors, Theory and Applications of Relational Structures as Knowledge Instruments, COST Action 274, TARSKI, Revised Papers. Volume 2929 of Lecture Notes in Computer Science, pages 214-230, Springer, 2003. [doi]
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