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Hund-Der Yeh; Ya-Chi Chang; Vitaly A. Zlotnik. (2008). Stream depletion rate and volume from groundwater pumping in wedge-shape aquifers. , 349(3-4), 501–511. doi:10.1016/j.jhydrol.2007.11.025 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research