R. GUBRYNOWICZ, D. CHOJNACKA-WĄDOŁOWSKA, and C. KONOPKA, “Assessment of velum malfunction in children through simultaneous nasal and oral acoustic signals measurements”, Arch. Acoust., vol. 32, no. 1, pp. 165–175, Apr. 2014, Accessed: Jan. 18, 2026. [Online]. Available: https://acoustics.ippt.gov.pl/index.php/aa/article/view/775