Qiong Liu, Zheng Pei, Liangzhong Yi, Jilin Yang. Generalized upper and lower approximations in set-valued information systems. In FUZZ-IEEE 2009, IEEE International Conference on Fuzzy Systems, Jeju Island, Korea, 20-24 August 2009, Proceedings. pages 616-620, IEEE, 2009. [doi]
Abstract is missing.