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Burdige, David J.; Dhakar, Surya P.; Nealson, Kenneth H. . (1992). Effects of manganese oxide mineralogy on microbial and chemical manganese reduction. Geomicrobiology Journal, 10(1), 27–48. doi:10.1080/01490459209377902 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research