T. Sakamoto, and T. Kato. Multimedia Information Analysis and Retrieval, volume 1464 of Lecture Notes in Computer Science, page 124-131. Springer, (1998)
D. Takaishi, H. Nishiyama, N. Kato, and R. Miura. PSATS, volume 148 of Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, page 94-105. (2014)