Inference of tree automata from sample set of trees. - H. Fukuda; K. Kamata (Int. J. Parallel Program., 1984)

Structural assessment of language learners' pronunciation. - Nobuaki Minematsu; K. Kamata; Satoshi Asakawa; Takehiko Makino; Tazuko Nishimura; Keikichi Hirose (INTERSPEECH, 2007)

Structural representation of pronunciation and its application for classifying Japanese learners of English. - Nobuaki Minematsu; K. Kamata; Satoshi Asakawa; Takehiko Makino; Keikichi Hirose (SLaTE, 2007)