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Gregorich, E. G.; Lapen, D. R.; Ma, B. L.; McLaughlin, N. B.; VandenBygaart, A. J. . (2011). Soil and Crop Response to Varying Levels of Compaction, Nitrogen Fertilization, and Clay Content. Soil Science Society of America Journal, 75(4), 1483–. doi:10.2136/sssaj2010.0395 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research