H. Leung, и V. Zue. Proceedings of the 1984 IEEE International Conference on Acoustics, Speech, and Signal Processing, (ICASSP), 9, стр. 73-76. San Diego, CA, USA, (марта 1984)
A. Hunt, и A. Black. Proceedings of the 1996 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 1, стр. 373-376. Atlanta, GA, USA, (мая 1996)