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Un-Hwan Park and  Jun-Hyeok Heo and  In-Sung Lee and  Dae-Kyu Park,  Design Optimization for Sound Absorption Material of Multi-Layer Structure.  [online]. World Academy of Science, Engineering and Technology. September 2018, vol. 12(9). 1121 - 1125[viewed 18 November 2017]. Available from: http://waset.org/abstracts/82871 .