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Chen, Hao; Shao, Zhihua; Hao, Yongxin; Rong, Qiangzhou . (2019). A high-frequency hydrophone using an optical fiber microknot resonator. Optics Communications, 446(), 77–83. doi:10.1016/j.optcom.2019.04.071 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research