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Birkel, Sean D.; Mayewski, Paul A.; Maasch, Kirk A.; Kurbatov, Andrei V.; Lyon, Bradfield . (2018). Evidence for a volcanic underpinning of the Atlantic multidecadal oscillation. npj Climate and Atmospheric Science, 1(1), 24–. doi:10.1038/s41612-018-0036-6 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research