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Zhao, Weijun; He, Zikai; Lam, Jacky W.Y.; Peng, Qian; Ma, Huili; Shuai, Zhigang; Bai, Gongxun; Hao, Jianhua; Tang, Ben Zhong . (2016). Rational Molecular Design for Achieving Persistent and Efficient Pure Organic Room-Temperature Phosphorescence. Chem, 1(4), 592–602. doi:10.1016/j.chempr.2016.08.010 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research