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Block, Timothy M; Mehta, Anand S; Fimmel, Claus J; Jordan, Robert. (2003). Molecular viral oncology of hepatocellular carcinoma. , 22(33), 5093–5107. doi:10.1038/sj.onc.1206557 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research