Gaudreau, M.-A., F. Laville, J. Voix, and H. Nelisse. “Variability of the Attenuation of the Auditory Protectors Measured by the Field-Sight Method As a Function of the Direction of the Incident Sound and Carrier Noises”. Canadian Acoustics, vol. 35, no. 3, Sept. 2007, pp. 80-81, https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1910.