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Keates, Susan G.; Kuzmin, Yaroslav V. . (2015). Shuidonggou localities 1 and 2 in northern China: archaeology and chronology of the Initial Upper Palaeolithic in north-east Asia. Antiquity, 89(345), 714–720. doi:10.15184/aqy.2015.22 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research