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Kang, E.-H.; Choi, S.-W.; Hong, S.-H. . (2012). Synthesis of Ba3Si6O12N2:Eu2+ Green Phosphors Using Ba3SiO5:Eu2+ Precursor and Their Luminescent Properties. ECS Journal of Solid State Science and Technology, 1(1), R11–R14. doi:10.1149/2.015201jss 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research