M. Ishikawa, H. Chen, K. Furuse, J. Yu, and N. Ohbo. Web-Age Information Management, volume 1846 of Lecture Notes in Computer Science, page 356-373. Springer, (2000)
Y. Luan, N. Ohbo, H. Kitagawa, and Y. Fujiwara. DASFAA, page 80-89. Dept. of Computer Science, KAIST, P.O. Box 150, ChongRyang, Seoul, 131-650, Korea, (1989)
K. Furuse, K. Yamaguchi, H. Kitagawa, and N. Ohbo. DASFAA, volume 4 of Advanced Database Research and Development Series, page 189-196. World Scientific, (1993)