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Salim, Devika; Bradford, William D.; Freeland, Amy; Cady, Gillian; Wang, Jianmin; Pruitt, Steven C.; Gerton, Jennifer L.; Hopper, Anita K. . (2017). DNA replication stress restricts ribosomal DNA copy number. PLOS Genetics, 13(9), e1007006–. doi:10.1371/journal.pgen.1007006 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research