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O. Seledets; J. Skubiszewska-Zięba; R. Leboda; V.M. Gun’ko. (2003). Surface properties of fumed silica/pyrocarbon prepared by pyrolysis of methylene chloride. , 82(1), 199–205. doi:10.1016/s0254-0584(03)00208-6 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research