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H.S. Wong; R.W. Zimmerman; N.R. Buenfeld. (2012). Estimating the permeability of cement pastes and mortars using image analysis and effective medium theory. , 42(2), 476–483. doi:10.1016/j.cemconres.2011.11.018 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research