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Long, C. A.; Marin, P.; Bayer, A. J.; Shetty, H. G.; Pathy, M. S. . (1991). Hypernatraemia in an adult in-patient population.. Postgraduate Medical Journal, 67(789), 643–645. doi:10.1136/pgmj.67.789.643 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research