W. Majewski, “MEL frequency cepstral coefficients (MFCC) of original speakers and their imitators”, Arch. Acoust., vol. 31, no. 4, pp. 445–449, Dec. 2006, Accessed: May 13, 2026. [Online]. Available: https://acoustics.ippt.pan.pl/index.php/aa/article/view/734