KOZIEŃ, Marek S., and Jerzy WICIAK. “Reduction of Structural Noise Inside Crane Cage by Piezoelectric Actuators - FEM Simulation”. Archives of Acoustics, vol. 33, no. 4, Jan. 2008, pp. 643–652, https://acoustics3.ippt.pan.pl/index.php/aa/article/view/561.