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Zhong, Jianwen; An, Ning; Yi, Ningbo; Zhu, Maoxia; Song, Qinghai; Xiao, Shumin . (2016). Broadband and Tunable-Focus Flat Lens with Dielectric Metasurface. Plasmonics, 11(2), 537–541. doi:10.1007/s11468-015-0087-z 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research