IMIOŁCZYK, J. Determination of perceptual boundaries between the male, female and child’s voices in isolated synthethic Polish vowels. Archives of Acoustics, [S. l.], v. 16, n. 2, p. 305–323, 1991. Disponível em: http://acoustics.ippt.gov.pl/index.php/aa/article/view/1233. Acesso em: 19 apr. 2026.