IMIOŁCZYK, J. “Determination of Perceptual Boundaries Between the Male, Female and child’s Voices in Isolated Synthethic Polish Vowels”. Archives of Acoustics 16, no. 2 (May 1, 2014): 305–323. Accessed April 29, 2025. https://acoustics3.ippt.pan.pl/index.php/aa/article/view/1233.