Adams, Scott, Kim Reyno-Briscoe, and Laura Hutchinson. “Acoustic Correlates of Monotone Speech in Parkinson’s Disease”. Canadian Acoustics 26, no. 3 (September 1, 1998): 86–87. Accessed September 23, 2021. https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1170.