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Kim, C. U.; Barstow, B.; Tate, M. W.; Gruner, S. M. . (2009). Evidence for liquid water during the high-density to low-density amorphous ice transition. Proceedings of the National Academy of Sciences, 106(12), 4596–4600. doi:10.1073/pnas.0812481106 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research