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Bottomley, P.S.. (1994). [SSSA Book Series] Methods of Soil Analysis: Part 2—Microbiological and Biochemical Properties || Nitrogen Mineralization, Immobilization, and Nitrification. , (), –. doi:10.2136/sssabookser5.2.c42 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research