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Wm.R. Even; R.W. Crocker; M.C. Hunter; N.C. Yang; T.J. Headley. (1995). Surface and near-surface structure in carbon microcellular materials produced from organic aerogels and xerogels. , 186(none), 0–199. doi:10.1016/0022-3093(95)00061-5 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research