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Zhou, Qihui; Liu, Peiguo; Bian, Li-an; Cai, Xin; Liu, Hanqing . (2018). Multi-band terahertz absorber exploiting graphene metamaterial. Optical Materials Express, 8(9), 2928–. doi:10.1364/ome.8.002928 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research