Using a ring parallel processor for hidden Markov model training. - David J. Pepper; Thomas P. Barnwell III; Mark A. Clements (IEEE Trans. Acoust. Speech Signal Process., 1990)

On the phonetic structure of a large hidden Markov model. - David J. Pepper; Mark A. Clements (ICASSP, 1991)

Phonemic recognition using a large hidden Markov model. - David J. Pepper; Mark A. Clements (IEEE Trans. Signal Process., 1992)

The CallManager system: A platform for intelligent telecommunications services. - David J. Pepper; Sharad Singhal; Scott Soper (Speech Commun., 1997)