M. ERZA, G. LEMARQUAND, and V. LEMARQUAND, “Distortion in Electrodynamic Loudspeakers Caused by Force Factor Variations”, Arch. Acoust., vol. 36, no. 4, pp. 873–885, Oct. 2013, Accessed: Jun. 21, 2025. [Online]. Available: https://acoustics.ippt.pan.pl/index.php/aa/article/view/150