Sibling Distance for Rooted Labeled Trees. - Taku Aratsu; Kouichi Hirata; Tetsuji Kuboyama (PAKDD Workshops, 2008)

Approximating Tree Edit Distance through String Edit Distance for Binary Tree Codes. - Taku Aratsu; Kouichi Hirata; Tetsuji Kuboyama (Fundam. Informaticae, 2010)