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Julia N. Zaitseva; Igor S. Yakimov; Sergei D. Kirik. (2009). Thermal transformation of quaternary compounds in NaF–CaF2–AlF3 system. , 182(8), 2246–2251. doi:10.1016/j.jssc.2009.05.043 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research