P. KRZYWORZEKA and W. CIOCH, “Demodulation of non-stationary machine vibration using cycle-time scale”, Arch. Acoust., vol. 31, no. 2, pp. 167–177, Mar. 2014, Accessed: Apr. 29, 2025. [Online]. Available: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/666