Leeper, H.A., and Michael Strong. “Classifying Subgroups of Individuals With ALS: Acoustic and Aerodynamic Characteristics”. Canadian Acoustics 26, no. 3 (September 1, 1998): 84–85. Accessed May 2, 2026. https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1169.