Proximity Scoring Using Sentence-Based Inverted Index for Practical Full-Text Search. - Yukio Uematsu; Takafumi Inoue; Kengo Fujioka; Ryoji Kataoka; Hayato Ohwada (ECDL, 2008)

Application of bitmap index to information retrieval. - Kengo Fujioka; Yukio Uematsu; Makoto Onizuka (WWW, 2008)