8MOHD N M J, JAMALUDIN N, MOHD T F. A preliminary study of sound absorption using multi-layer coconut coir fibers [ J]. Technical Acoustics, 2004 (3) : 1-8.
9KUCUK Haluk, ERSOY Sezgin. Investigation of industrial tea-leaf-fibre waste material for its sound absorption properties [J]. Applied Acoustics, 2007, 70(1) : 215 -220.
10YU Xiang, LU Lihua, WEI Chunyan, et al. Research on sound absorption properties of muhilayer structural material based on discarded polyester fiber [ J]. The Journal of The Textile Institute, 2014, 105 (10): 1009 - 1013.