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Miyasaka, Tsutomu. (2015). Perovskite Photovoltaics: Rare Functions of Organo Lead Halide in Solar Cells and Optoelectronic Devices. Chemistry Letters, 44(6), 720–729. doi:10.1246/cl.150175 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research