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Li, Xun; Duan, Baoyan; Song, Liwei; Zhang, Yiqun; Xu, Wanye . (2017). Study of Stepped Amplitude Distribution Taper for Microwave Power Transmission for SSPS. IEEE Transactions on Antennas and Propagation, 65(10), 5396–5405. doi:10.1109/tap.2017.2734061 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research