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M. Stockenhuber; R.W. Joyner; J.M. Dixon; M.J. Hudson; G. Grubert. (2001). Transition metal containing mesoporous silicas – redox properties, structure and catalytic activity. , 44-45(none), 367–375. doi:10.1016/s1387-1811(01)00203-7 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research