T. Yoshimura, K. Tokuda, T. Masuko, T. Kobayashi, and T. Kitamura. Proceedings of the 6th European Conference on Speech Communication and Technology (EUROSPEECH), page 2374-2350. Budapest, Hungary, (September 1999)
K. Tokuda, T. Yoshimura, T. Masuko, T. Kobayashi, and T. Kitamura. Proceedings of the 2000 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 3, page 1315-1318. Istanbul, Turkey, (June 2000)
T. Yoshimura, K. Tokuda, T. Masuko, T. Kobayashi, and T. Kitamura. Proceedings of the 7th European Conference on Speech Communication and Technology (EUROSPEECH/INTERSPEECH), page 2263-2266. Aalborg, Denmark, (September 2001)