Masami Kurano Masami Yasuda Jun-ichi Nakagami Yuji Yoshida An approach to stopping problems of a dynamic fuzzy system. 225-233 2002 131 Fuzzy Sets and Systems 2 http://www.sciencedirect.com/science/article/B6V05-44RNK19-2/2/59e68e04da2618a31bafb2199ee48631 db/journals/fss/fss131.html#KuranoYNY02