Mining Closed and Maximal Frequent Induced Free Subtrees. - Hitohiro Shiozaki; Tomonobu Ozaki; Takenao Ohkawa (ICDM Workshops, 2006)

Entity Ranking from Annotated Text Collections Using Multitype Topic Models. - Hitohiro Shiozaki; Koji Eguchi (INEX, 2007)

Entity Network Prediction Using Multitype Topic Models. - Hitohiro Shiozaki; Koji Eguchi; Takenao Ohkawa (IEICE Trans. Inf. Syst., 2008)