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Wider, Gerhard; Riek, Roland; Wüthrich, Kurt . (1996). Diffusion Filters for Separation of Solvent−Protein and Protein−Protein Nuclear Overhauser Effects (HYDRA). Journal of the American Chemical Society, 118(46), 11629–11634. doi:10.1021/ja9607188 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research