Viallet, G., F. Sgard, and F. Laville. “Development of a Simplified Axi-Symmetric Finite Element Model of the Auditory Canal Occluded by an Earplug: Variability of the Attenuation As a Function of the Input Parameters”. Canadian Acoustics, vol. 39, no. 3, Sept. 2011, pp. 100-1, https://jcaa.caa-aca.ca/index.php/jcaa/article/view/2430.