1. Anderson, T.W.: An introduction to multivariate statistical analysis, second edn. Wiley, New York (1984)
2. Kawahara, T., Lee, C.-H., and Juang, B.-H., Combining key-phrase detection and subword-based verification for flexible speech understanding, in Proceedings of ICASSP (Munich), pp. 1159–1162, May 1997
3. Lee, C.-H., Juang, B.-H., Chou, W., and Molina-Perez, J. J., A study on task- independent subword selection and modeling for speech recognition, in Proc. of ICSLP (Philadelphia), pp. 1816–1819, Oct. 1996
4. Li, Q. and Juang, B.-H., Speaker verification using verbal information veri- fication for automatic enrollment, in Proceedings of the IEEE International Conference on Acoustics, Speech, and Signal Processing (Seattle), May 1998
5. Li, Q., Juang, B.-H., Zhou, Q., Lee, C.-H.: Automatic verbal informa- tion verification for user authentication. IEEE Trans. on Speech and Audio Processing 8, 585–596 (2000)