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Gentry, Lowell E.; David, Mark B.; Smith‐Starks, Karen M.; Kovacic, David A. . (2000). Nitrogen Fertilizer and Herbicide Transport from Tile Drained Fields. Journal of Environmental Quality, 29(1), 232–240. doi:10.2134/jeq2000.00472425002900010030x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research