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Nadine Staiger; Prof. Dr. Andreas Marx. (2010). A DNA Polymerase with Increased Reactivity for Ribonucleotides and C5-Modified Deoxyribonucleotides. , 11(14), 1963–1966. doi:10.1002/cbic.201000384 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research