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Wu, Hui; Zhou, Wei; Yildirim, Taner . (2009). High-Capacity Methane Storage in Metal−Organic Frameworks M <sub/>2</sub> (dhtp): The Important Role of Open Metal Sites. Journal of the American Chemical Society, 131(13), 4995–5000. doi:10.1021/ja900258t 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research