Rong Yang Zhenyuan Wang Pheng-Ann Heng Kwong-Sak Leung Fuzzy numbers and fuzzification of the Choquet integral. 95-113 2005 153 Fuzzy Sets and Systems 1 http://dx.doi.org/10.1016/j.fss.2004.12.009 db/journals/fss/fss153.html#YangWHL05