1. 1) T. Chiba and M. Kajiyama, The Vowel: Its Nature and Structure (Tokyo-Kaiseikan, Tokyo, 1942) [Reprinted by Phonetic Society of Japan (1958)].
2. 2) G. Fant, Acoustic Theory of Speech Production (Mouton, The Hague, 1960).
3. 3) J. L. Kelly and C. C. Lochbaum, “Speech synthesis,” Proc. 4th Int. Congr. Acoustics, G42, pp. 1–4 [Reprinted in Speech Synthesis, J. L. Flanagan and L. R. Rabiner, Eds. (Dowden, Hutchinson & Ross, Stroudsburg, 1973), pp. 127–130].
4. Measurement of sound‐pressure distribution in replicas of the oral cavity
5. Finite element simulation of sound transmission in vocal tract.