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R.W. Triebe; F.H. Tezel. (1996). 96/03126 - Adsorption of nitrogen, carbon monoxide, carbon dioxide and nitric oxide on molecular sleves. , 37(3), 216–0. doi:10.1016/0140-6701(96)89033-3 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research