Zheng, Y., C. Giguère, C. Laroche, and C. Sabourin. “Detectsound Version 2: A Software Tool for Adjusting the Level and Spectrum of Acoustic Warning Signals”. Canadian Acoustics, vol. 31, no. 3, Sept. 2003, pp. 76-77, https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1558.