Doroshenko, E., Y. Tereshchenko, I. Lastivka, and Y. Tereshchenko. “Calculation of Sound Power Level of Tandem Axial Fan”. Eastern-European Journal of Enterprise Technologies, vol. 6, no. 5 (90), Nov. 2017, pp. 8-12, doi:10.15587/1729-4061.2017.114038.