Yasuhiro Sudo Masahito Kurihara Tamotsu Mitamura Extending Fuzzy Constraint Satisfaction Problems. 465-471 2006 10 JACIII 4 http://www.fujipress.jp/finder/xslt.php?mode=present&inputfile=JACII001000040004.xml db/journals/jaciii/jaciii10.html#SudoKM06