ANDRZEJEWSKI, M., and C. CEMPEL. “Location of the Sources of Vibroacoustic Disturbances in Continuous Mechanical Objects in the Case of a Bottling Line”. Archives of Acoustics, vol. 5, no. 4, Dec. 1980, pp. 275-88, https://acoustics.ippt.gov.pl/index.php/aa/article/view/3344.