W. JASSEM, D. GEMBIAK, and A. DYCZKOWSKI, “Computer-aided recognition of polish vowels in continuous speech”, Arch. Acoust., vol. 4, no. 1, pp. 39–54, Mar. 1979, Accessed: Mar. 04, 2026. [Online]. Available: https://acoustics.ippt.gov.pl/index.php/aa/article/view/3355