Cui, Jie, Alberto Behar, Hans Kunov, and Willy Wong. “Testing of ANR Earmuffs”. Canadian Acoustics 30, no. 3 (September 1, 2002): 124–125. Accessed September 26, 2024. https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1486.