Shih-Wei Kau Hung-Jen Lee Ching-Mao Yang Ching-Hsiang Lee Lin Hong Chun-Hsiung Fang 135-146 2007 158 Fuzzy Sets and Systems 2 http://dx.doi.org/10.1016/j.fss.2006.09.010 db/journals/fss/fss158.html#KauLYLHF07