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W. J. Malfait; S. Zhao; R. Verel; S. Iswar; D. Rentsch; R. Fener; Y. Zhang; B. Milow; M. M. Koebel. (2015). The Surface Chemistry of Hydrophobic Silica Aerogels. , (), –. doi:10.1021/acs.chemmater.5b02801 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research