ZHIVOMIROV, Hristo, and Ivaylo NEDELCHEV. “A Method for Signal Stationarity Estimation”. Romanian Journal of Acoustics and Vibration 17, no. 2 (December 30, 2020): 149-155. Accessed January 26, 2021. http://rjav.sra.ro/index.php/rjav/article/view/178.