Signature Coding for Meta Objects. - Takao Miura; Wataru Matsumoto; Shingo Kashikawa; Isamu Shioya (WISE (2), 2000)

Logical optimization for meta queries. - Wataru Matsumoto; Shingo Kashikawa; Takao Miura; Isamu Shioya (CATA, 2001)

Aggregates as Meta Functions. - Shingo Kashikawa; Shogo Ogura; Isamu Shioya; Takao Miura (ISMIS, 2002)