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P. Judeinstein; P.W. Oliveira; H. Krug; H. Schmidt. (1994). Dynamics of the sol—gel transition in organic—inorganic nanocomposites. , 220(1-2), 35–39. doi:10.1016/0009-2614(94)00142-1 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research