Jin Han Park Jong Seo Park Young Chel Kwun On Fuzzy Inclusion in the Interval-Valued Sense. 1-10 2005 conf/fskd/2005-1 FSKD (1) http://dx.doi.org/10.1007/11539506_1 db/conf/fskd/fskd2005-1.html#ParkPK05