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Li, Yunfeng; Zhou, Minghua; Cheng, Bei; Shao, Yan . (2020). Recent advances in g-C3N4-based heterojunction photocatalysts. Journal of Materials Science & Technology, (), S1005030220303601–. doi:10.1016/j.jmst.2020.04.028 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research