M. Yoshida, T. Iizuka, H. Shiohara, and M. Ishiguro. Data Mining and Knowledge Discovery: Theory, Tools, and Technology, volume 4057 of SPIE Proceedings, page 213-220. SPIE, (2000)
S. Tsuru, Y. Iizuka, and M. Munechika. Nursing Informatics, volume 146 of Studies in Health Technology and Informatics, page 391-395. IOS Press, (2009)