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Anwar, Shahzad; Li, Sucheng; Li, Shuo; Duan, Qian; Lu, Weixin; Hou, Bo . (2015). Topology-induced, strongly diamagnetic response of hollow structured metals at broadband microwave frequencies. Applied Physics A, 121(3), 1061–1066. doi:10.1007/s00339-015-9133-0 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research