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Liang, B. C.; MacKenzie, A. F. . (1994). Changes of Soil Nitrate-Nitrogen and Denitrification as Affected by Nitrogen Fertilizer on Two Quebec Soils. Journal of Environment Quality, 23(3), 521–. doi:10.2134/jeq1994.00472425002300030017x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research