Sbihi, H., K. Teschke, Y. MacNab, and H. W. Davies. “Adjusting Historical Noise Estimates by Accounting for Hearing Protection Use: A Probabilistic Approach and Validation”. Canadian Acoustics, vol. 36, no. 3, Sept. 2008, pp. 100-1, https://jcaa.caa-aca.ca/index.php/jcaa/article/view/2057.