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Beecher, Consuelo N.; Larive, Cynthia K. . (2015). <sup>1</sup> H and <sup>15</sup> N NMR Characterization of the Amine Groups of Heparan Sulfate Related Glucosamine Monosaccharides in Aqueous Solution. Analytical Chemistry, 87(13), 6842–6848. doi:10.1021/acs.analchem.5b01181 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research