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Long-Lasting Phosphorescence in BaSi2O2N2 : Eu2 + and Ba2SiO4 : Eu2 + Phases for X-Ray and Cathode Ray Tubes, Wang, Meiyuan, Zhang, Xia, Hao, Zhendong, Ren, Xinguang, Luo, Yongshi, Zhao, Haifeng, Wang, Xiaojun, Zhang, Jiahua
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Wang et al. (2009) studied this question.
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