Extraordinary acoustic scattering in a periodic PT-symmetric zero-index metamaterials waveguideWen-Qian Ji, Qi Wei, Xing-Feng Zhu, Da-Jian Wu and Xiao-Jun LiuEPL, 125 5 (2019) 58002DOI: https://doi.org/10.1209/0295-5075/125/58002
