Myung-Sub KimJun YanKyung-Min KangKyung-Hoon JooYeon-June KangSung-Hoon Ahn, Soundproofing ability and mechanical properties of polypropylene/exfoliated graphite nanoplatelet/carbon nanotube (PP/xGnP/CNT) composite International, Journal of Precision Engineering and Manufacturing, 14(6) : 1087-1092 2013