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Tang Wanjun, Fu Tingting. (2014). Luminescence and energy transfer in Eu2+,Mn2+codoped Na2BaMgP2O8phosphor. , 114(3), 931–935. doi:10.1007/s00339-013-7777-1 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research