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C. Görller-Walrand; M. Behets; P. Porcher; W.T. Carnall. (1986). Intensity parametrization of the LiYF4Eu3+ fluorescence spectrum. , 126(none), 0–276. doi:10.1016/0022-5088(86)90292-4 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research