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Robart, A. R.; Seo, W.; Zimmerly, S. . (2007). Insertion of group II intron retroelements after intrinsic transcriptional terminators. Proceedings of the National Academy of Sciences, 104(16), 6620–6625. doi:10.1073/pnas.0700561104 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research