The acoustic characteristics of vowels and diphthongs. Kent, R. D and Read, C In The acoustic analysis of speech, pages 87-104. Whurr - Singular Publishing Group, London - San Diego.
bibtex   
@incollection{kent_acoustic_1992-2,
	Address = {London - San Diego},
	Author = {Kent, Raymond D and Read, C},
	Booktitle = {The acoustic analysis of speech},
	Date = {1992},
	Date-Modified = {2016-09-24 18:56:06 +0000},
	Keywords = {acoustic cues, acoustic phonetics, phonetics, segmental},
	Pages = {87-104},
	Publisher = {Whurr - Singular Publishing Group},
	Title = {The acoustic characteristics of vowels and diphthongs}}
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