Effects of Aperture Shape on Absorption Property of Acoustic Metamaterial of Parallel-Connection Helmholtz Resonator. - Bi, Shaohua; Yang, Fei; Tang, Shuai; Shen, Xinmin; Zhang, Xiaonan; Zhu, Jingwei; Yang, Xiaocui; Peng, Wenqiang; Yuan, Feng (Materials (1996-1944), 2023)