Dong-kai Zhang Wen-li Feng Ji-Qing Qiu Duo-Ming Xi On the Study of Linear Properties for Fuzzy-Number-Valued Fuzzy Integrals. 227-232 2008 ACFIE http://dx.doi.org/10.1007/978-3-540-88914-4_29 conf/acfie/2008 db/conf/acfie/acfie2008.html#ZhangFQX08