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Feoktistova, Maria; Geserick, Peter; Leverkus, Martin . (2016). Crystal Violet Assay for Determining Viability of Cultured Cells. Cold Spring Harbor Protocols, 2016(4), pdb.prot087379–. doi:10.1101/pdb.prot087379 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research