Che Ku Husin, Che Ku Eddy Nizwan, et al. “Spectral Subtraction-Based Filter for Experimental Modal Analysis under Harmonics Excitation Force”. Journal of Mechanical Engineering and Sciences, vol. 15, no. 4, Dec. 2021, pp. 8480-9, https://doi.org/10.15282/jmes.15.4.2021.02.0668.