Ibbotson, Peter Alexander, Jason Cambridge, and John Pearse. “An Investigation into Wind Generated Aero-Acoustic Tones”. Canadian Acoustics 36, no. 3 (September 1, 2008): 52-53. Accessed May 11, 2021. https://jcaa.caa-aca.ca/index.php/jcaa/article/view/2033.