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Hashemi, Seyyed Alireza; Ramakrishna, Seeram; Aberle, Armin . (2020). Recent Progress in Flexible-Wearable Solar Cells for Self-Powered Electronic Devices. Energy & Environmental Science, (), 10.1039.C9EE03046H–. doi:10.1039/c9ee03046h 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research