Myung-Sub Kim, Jun Yan, Kyung-Min Kang, Kyung-Hoon Joo, Yeon-June Kang, Sung-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