By Kent R.D.   Vorperian H.K.   Kent J.F.   Duffy J.R.   in Journal of Communication Disorders

ISSN:0021-9924|36|4|281-306

Elsevier‎(2003)‎

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By Kent R.D.   Kent J.F.   Weismer G.   Duffy J.R.   in Journal of Phonetics

ISSN:0095-4470|28|3|273-302

Academic Press‎(2000)‎

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