William J. Barry. Perception and Production of English Vowels by German Learners: Instrumental-Phonetic Support in Language Teaching.  In  Phonetica, Vol.  46:155-168,   1989.
 @Article{Barry:1989_2,
        AUTHOR = {Barry, William J.},
        TITLE = {Perception and Production of English Vowels by German Learners: Instrumental-Phonetic Support in Language Teaching},
        YEAR = {1989},
        JOURNAL = {Phonetica},
        VOLUME = {46},
        PAGES = {155-168} } 
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