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Jiuping Zhong; Hongbin Liang; Bing Han; Qiang Su; Ye Tao. (2008). NaGd(PO3)4:Tb3+ – A new promising green phosphor for PDPs application. , 453(4-6), 192–196. doi:10.1016/j.cplett.2008.01.032 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research