Mykhalkiv, Serhii, et al. “Identification of Axle-Box Bearing Faults of Freight Cars Based on Minimum Entropy Deconvolution and Squared Envelope Spectra”. International Journal of Engineering & Technology, vol. 7, no. 4.3, Sept. 2018, pp. 167-73, https://doi.org/10.14419/ijet.v7i4.3.19729.