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Un-Hwan Park and  Jun-Hyeok Heo and  In-Sung Lee and  Tae-Hyeon Oh and  Dae-Kyu Park,  The Design Optimization for Sound Absorption Material of Multi-Layer Structure.  [online]. World Academy of Science, Engineering and Technology. September 2018, vol. 12(9). 1033 - 1037[viewed 17 October 2018]. Available from: http://waset.org/abstracts/82871 .