Ju Hyuk Park, Kyung Suh Minn, Hyeong Rae Lee, Sei Hyun Yang, Cheng Bin Yu, Seong Yeol Pak, Chi Sung Oh, Young Seok Song, Yeon June Kang, Jae Ryoun Youn, Cell openness manipulation of low density polyurethane foam for efficient sound absorption, Journal of Sound and Vibration, 406() : 224-236 2017