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Slover, C. M; Rodvold, K. A; Danziger, L. H . (2007). Tigecycline: A Novel Broad-Spectrum Antimicrobial. Annals of Pharmacotherapy, 41(6), 965–972. doi:10.1345/aph.1h543 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research