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Yan, Jinyue; Yang, Ying; Elia Campana, Pietro; He, Jijiang . (2019). City-level analysis of subsidy-free solar photovoltaic electricity price, profits and grid parity in China. Nature Energy, 4(8), 709–717. doi:10.1038/s41560-019-0441-z 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research