Xizhao Wang Yadong Wang X. F. Xu W. D. Ling Daniel S. Yeung A new approach to fuzzy rule generation: fuzzy extension matrix. 291-306 2001 123 Fuzzy Sets and Systems 3 http://www.sciencedirect.com/science/article/B6V05-43T7RR4-2/2/54169a43ebe964a9b9e1b95152ffa540 db/journals/fss/fss123.html#WangWXLY01