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Guo, Quanbing; Ou, Zhenwei; Tang, Jibo; Zhang, Jing; Lu, Fengya; Wu, Ke; Zhang, Douguo; Zhang, Shunping; Xu, Hongxing . (2020). Efficient Frequency Mixing of Guided Surface Waves by Atomically Thin Nonlinear Crystals. Nano Letters, (), acs.nanolett.0c02736–. doi:10.1021/acs.nanolett.0c02736 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research