Z. Skup, “Forced Vibration of a Nonlinear Stationary System with a Friction Clutch, Structural Friction Being Taken Into Consideration”, Eng. Trans., vol. 39, no. 3-4, pp. 369–387, Dec. 1991, Accessed: Jan. 17, 2026. [Online]. Available: http://et.ippt.gov.pl/index.php/et/article/view/1632