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Choi YW, Yeom YT, Kim HJ, Song SJ, Ryu SW, Kim HH, Park JS, Kwon* SD.  A Study on the Analysis of Various Void Depth at Multiple layer Using Impact Echo Method.  New Phys.: Sae Mulli 2021;71:310-315.  https://doi.org/10.3938/NPSM.71.310