R. MŁYŃSKI, E. KOZŁOWSKI, and J. ADAMCZYK, “Assessment of Impulse Noise Hazard and the Use of Hearing Protection Devices in Workplaces where Forging Hammers are Used”, Arch. Acoust., vol. 39, no. 1, pp. 73–79, Dec. 2014, doi: 10.2478/aoa-2014-0008.