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Cho, Sumin; Yun, Yeongcheol; Jang, Sunmin; Ra, Yoonsang; Choi, Jun Hyuk; Hwang, Hee Jae; Choi, Dukhyun; Choi, Dongwhi . (2020). Universal biomechanical energy harvesting from joint movements using a direction-switchable triboelectric nanogenerator. Nano Energy, 71(), 104584–. doi:10.1016/j.nanoen.2020.104584 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research