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M.U. Sharif; R.K. Davis; K.F. Steele; B. Kim; T.M. Kresse; J.A. Fazio. (2008). Inverse geochemical modeling of groundwater evolution with emphasis on arsenic in the Mississippi River Valley alluvial aquifer, Arkansas (USA). , 350(1-2), 41–55. doi:10.1016/j.jhydrol.2007.11.027 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research