Smutny, Jaroslav, Viktor Nohal, Daniela Vukusicova, and Herbert Seelmann. “Vibration Analysis by the Wigner-Ville Transformation Method”. Communications - Scientific letters of the University of Zilina 20, no. 4 (December 31, 2018): 24-28. Accessed January 18, 2022. http://communications.uniza.sk/index.php/communications/article/view/635.