W. NOWAKOWSKA, R. GUBRYNOWICZ, and P. ŻARNECKI, “On the model of vocal tract dynamics”, Arch. Acoust., vol. 18, no. 4, pp. 525–537, Dec. 1993, Accessed: Mar. 04, 2026. [Online]. Available: https://acoustics.ippt.gov.pl/index.php/aa/article/view/1161