Adaptation of reference speaker HMM word models for speaker-independent recognition. - David J. B. Pearce; Lynn C. Wood (ICASSP, 1991)

Improved vocabulary-independent sub-word HMM modelling. - Lynn C. Wood; David J. B. Pearce; Frederic Novello (ICASSP, 1991)

Allophone modeling for vocabulary-independent HMM recognition. - Wendy J. Holmes; Lynn C. Wood; David J. B. Pearce (ICASSP (2), 1993)