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G. Quercia; G. Hüsken; H.J.H. Brouwers. (2012). Water demand of amorphous nano silica and its impact on the workability of cement paste. , 42(2), 344–357. doi:10.1016/j.cemconres.2011.10.008 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research