EKICI, Bulent, Aykut KENTLI, and Haluk KUCUK. “Improving Sound Absorption Property of Polyurethane Foams by Adding Tea-Leaf Fibers”. Archives of Acoustics 37, no. 4 (October 17, 2013): 515–520. Accessed January 18, 2026. https://acoustics.ippt.gov.pl/index.php/aa/article/view/80.