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Novokmet, Slobodan; Heinemann, Frank W.; Zahl, Achim; Alsfasser, Ralf . (2005). Aromatic Interactions in Unusual Backbone Nitrogen-Coordinated Zinc Peptide Complexes:  A Crystallographic and Spectroscopic Study. Inorganic Chemistry, 44(13), 4796–4805. doi:10.1021/ic0500053 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research