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Park, S.-C.; Gaye, H.; Lee, H.-G. . (2009). Interfacial tension between molten iron and CaO–SiO <sub/>2</sub> –MgO–Al <sub/>2</sub> O <sub/>3</sub> –FeO slag system. Ironmaking & Steelmaking, 36(1), 3–11. doi:10.1179/174328108x358622 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research