Collective coupling of randomly dispersed oscillators with cavities filled with zero-index metamaterialsXiaohu Xu, Haitao Jiang, Yong Sun, Wenxing Liu, Yunhui Li and Hong ChenEur. Phys. J. B, 87 2 (2014) 44DOI: https://doi.org/10.1140/epjb/e2014-41061-2