Anweiler, Stanisław, Waldemar Fedak, Wojciech Gancarski, and Roman Ulbrich. “Power Spectrum Analysis for Determination of the Number of Vertical Axis Wind Turbine Blades”. Journal of Mechanical and Energy Engineering 1, no. 2 (November 1, 2017): 153-162. Accessed January 20, 2021. https://jmee.tu.koszalin.pl/ojs/index.php/jmee/article/view/32.