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Blodgett, J. A. V.; Oh, D.-C.; Cao, S.; Currie, C. R.; Kolter, R.; Clardy, J. . (2010). Common biosynthetic origins for polycyclic tetramate macrolactams from phylogenetically diverse bacteria. Proceedings of the National Academy of Sciences, 107(26), 11692–11697. doi:10.1073/pnas.1001513107 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research