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Nan, Honghong; Ma, Wenqin; Hu, Qingqing; Zhang, Xiaojun . (2015). Copper oxide nanofilm on 3D copper foam as a novel electrode material for supercapacitors. Applied Physics A, 119(4), 1451–1457. doi:10.1007/s00339-015-9119-y 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research