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Zhu, Xinkai; Cheng, Ming; Li, Xianglin; Wang, Yubin . (2019). Topology Analysis, Design, and Comparison of High Temperature Superconducting Double Stator Machine with Stationary Seal. IEEE Transactions on Applied Superconductivity, (), 1–1. doi:10.1109/TASC.2019.2914041 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research