ZENG, Youjie, Jianxin PENG, and Lei ZHAO. “Investigation of the Acoustical Environment of the Elderly’s Living Place”. Archives of Acoustics 43, no. 3 (September 30, 2018): 531–536. Accessed March 4, 2026. https://acoustics.ippt.gov.pl/index.php/aa/article/view/2191.