Takashi Mitsuishi Yasunari Shidama Admissible Fuzzy Controller in L2 Space. 62-71 2008 IEA/AIE http://dx.doi.org/10.1007/978-3-540-69052-8_7 conf/ieaaie/2008 db/conf/ieaaie/ieaaie2008.html#MitsuishiS08