Investigation of Helmholtz resonator-based composite acoustic metamaterial.Published in:Applied Physics A: Materials Science & Processing, 2019, v. 125, n. 1, p. 1, doi. 10.1007/s00339-018-2323-9By:Gebrekidan, Semere Birhane;Kim, Hak-Joon;Song, Sung-JinPublication type:Article