Skup, Z. (1991) “Forced Vibration of a Nonlinear Stationary System with a Friction Clutch, Structural Friction Being Taken Into Consideration”, Engineering Transactions, 39(3-4), pp. 369–387. Available at: https://et.ippt.pan.pl/index.php/et/article/view/1632 (Accessed: 14 July 2025).