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Tracy L. Dalton; Rhonda I. Hobb; June R. Scott. (2006). Analysis of the role of CovR and CovS in the dissemination of Streptococcus pyogenes in invasive skin disease. , 40(5), 0–227. doi:10.1016/j.micpath.2006.01.005 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research