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Jie Han; Yangsi Liu; Naresh Singhal; Lianzhou Wang; Wei Gao. (2012). Comparative photocatalytic degradation of estrone in water by ZnO and TiO2 under artificial UVA and solar irradiation. , 213(none), –. doi:10.1016/j.cej.2012.09.066 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research