Novak, C., H. Ule, and R. Gaspar. “Effect on Noise Emissions from Varying Distance Between Heat-Sink Fin to Cooling Fan Blade Tip”. Canadian Acoustics, vol. 35, no. 1, Mar. 2007, pp. 55-59, https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1871.