References
- Willis . 1830 . On vowel sounds, and on reed organ pipes . Trans. Camb. Phil. Soc , III : 231
- Stewart , G. W. , ed. Accoustics 60
References
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- _____ . 1906 . Researches in Experimental Phonetics , 7 109 – 112 . 114 Carnegie Institute of Washington .
- Miller , D. C. 1916 . Science of Musical Sounds 215 – 251 .