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Chen Yang; Huiqing Fan; Yingxue Xi; Jin Chen; Zhuo Li. (2008). Effects of depositing temperatures on structure and optical properties of TiO2 film deposited by ion beam assisted electron beam evaporation. , 254(9), 2685–2689. doi:10.1016/j.apsusc.2007.10.006 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research