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Liu, Qiang; Yang, Qiu Hong; Zhao, Guang Gen; Lu, Shen Zhou; Zhang, Hao Jia . (2013). The thermoluminescence and optically stimulated luminescence properties of Cr-doped alpha alumina transparent ceramics. Journal of Alloys and Compounds, 579(), 259–262. doi:10.1016/j.jallcom.2013.06.070 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research