Instruction and cognition analysis applying fuzzy graphs. - Hajime Yamashita; Ei Tsuda; Yasuo Katsumata (Int. J. Approx. Reason., 1991)

Relational structure analysis of fuzzy graph and its application: For analyzing fuzzy data of human relation. - Hiroaki Uesu; Kenichi Nagashima; Hsunhsun Chung; Ei Tsuda (FUZZ-IEEE, 2011)