An A* Algorithm for Computing Edit Distance between Rooted Labeled Unordered Trees. - Shoichi Higuchi; Tomohiro Kan; Yoshiyuki Yamamoto; Kouichi Hirata (JSAI-isAI Workshops, 2011)

An Isolated-Subtree Inclusion for Unordered Trees. - Takahiro Hokazono; Tomohiro Kan; Yoshiyuki Yamamoto; Kouichi Hirata (IIAI-AAI, 2012)

Segmental Mapping and Distance for Rooted Labeled Ordered Trees. - Tomohiro Kan; Shoichi Higuchi; Kouichi Hirata (Fundam. Informaticae, 2014)