Żera, J., and R. Młyński. “Efficiency of Attenuating High-Level Acoustic Impulses With Double Protection (earplugs and Earmuffs Used Simultaneously)”. Archives of Acoustics 31, no. 4(S) (January 1, 2014): 319–324. Accessed April 25, 2025. https://acoustics3.ippt.pan.pl/index.php/aa/article/view/1362.