Parsa, V., and D.G. Jamieson. “Comparison of F0 Extraction Algorithms for Sustained Vowels”. Canadian Acoustics 25, no. 3 (September 1, 1997): 14–14. Accessed April 23, 2024. https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1084.