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Chen, Mao; Hou, Xinmei; Chen, Junhong; Zhao, Baojun . (2016). Phase Equilibria Studies in the SiO2-K2O-CaO System. Metallurgical and Materials Transactions B, 47(3), 1690–1696. doi:10.1007/s11663-016-0623-z 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research