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D. Dutta; S. Chatterjee; K.T. Pillai; P.K. Pujari; B.N. Ganguly. (2005). Pore structure of silica gel: a comparative study through BET and PALS. , 312(1-3), 319–324. doi:10.1016/j.chemphys.2004.12.008 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research