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Stolper, D. A.; Revsbech, N. P.; Canfield, D. E. . (2010). Aerobic growth at nanomolar oxygen concentrations. Proceedings of the National Academy of Sciences, 107(44), 18755–18760. doi:10.1073/pnas.1013435107 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research