References
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- Dougenik J., Sheenan D. Symap user's reference manual; revised 1977. Harvard University, Cambridge 1975
- Fant G. Acoustic theory of speech production. Mouton, The Hague 1970
- Jones D. An outline of English phonetics. Heffer, Cambridge 1956
- Suonpää J., Aaltonen O. The validity of real-time spectrum analysis of Finnish vowel formants in profoundly hearing-impaired children. Scand. Audiol. 1982; 11: 44–48
- Wiik K. The stressed single vowels of Finnish and English: an articulatory-acoustic-perceptual comparison. 1960, unpubl. licentiate thesis Turku
- Wiik K. Finnish and English vowels. Annls Univ., Turku 1965