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D. Jia; Xiao-jun Wang; E. van der Kolk; W.M. Yen. (2002). Site dependent thermoluminescence of long persistent phosphorescence of BaAl2O4:Ce3+. , 204(1-6), 247–251. doi:10.1016/s0030-4018(02)01300-7 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research