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Liu, Donghui; Zhang, Weiwei; Yong, Huadong; Zhou, Youhe . (2018). Thermal stability and mechanical behavior in no-insulation high-temperature superconducting pancake coils. Superconductor Science and Technology, 31(8), 085010–. doi:10.1088/1361-6668/aad00c 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research