Structural analysis for web documentation using the non-well-founded set. - Ikumi Horie; Kazunori Yamaguchi (Hypertext, 2004)

Higher-order rank analysis for web structure. - Ikumi Horie; Kazunori Yamaguchi; Kenji Kashiwabara (Hypertext, 2005)

Pattern detection from web using AFA set theory. - Ikumi Horie; Kazunori Yamaguchi; Kenji Kashiwabara (WIDM, 2007)

Improvement of difficulty estimation of personalized teaching material generator by JACET. - Ikumi Horie; Kazunori Yamaguchi; Kenji Kashiwabara; Yoshitatsu Matsuda (ITHET, 2014)

Higher-Order Rank Functions on Directed Graphs. - Kenji Kashiwabara; Ikumi Horie; Kazunori Yamaguchi (Fundam. Informaticae, 2020)