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Farina, Fatha Ema; Binti Azmi, Wafa Syakira; Harafuji, Kenji . (2017). Ultraviolet-ozone anode surface treatment and its effect on organic solar cells. Thin Solid Films, 623(), 72–83. doi:10.1016/j.tsf.2016.12.031 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research