XiangPeng Li, Min Dong, Qing Liu. Axiomatic Approaches of the Approximation Operation based on Rough Sets and Fuzzy Rough Sets. In The 2008 IEEE International Conference on Granular Computing, GrC 2008, Hangzhou, China, 26-28 August 2008. pages 393-396, IEEE, 2008. [doi]
Abstract is missing.