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Peeling, Rosanna W.; Mabey, David; Kamb, Mary L.; Chen, Xiang-Sheng; Radolf, Justin D.; Benzaken, Adele S. . (2017). Syphilis. Nature Reviews Disease Primers, 3(), 17073–. doi:10.1038/nrdp.2017.73 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research