Gover, Bradford N., and John S. Bradley. “Comparison of Subjective and Objective Ratings of Intelligibility of Speech Recordings”. Canadian Acoustics 35, no. 3 (September 1, 2007): 140-141. Accessed July 9, 2020. https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1940.