Dien, Nguyen Phong. “Damping Identification Using the Wavelet-Based Demodulation Method: Application to Gearbox Signals”. Technische Mechanik - European Journal of Engineering Mechanics, vol. 28, no. 3-4, Aug. 2019, pp. 324-33, https://journals.ub.ovgu.de/index.php/techmech/article/view/853.