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Qin, Yong; Yin, Xiaosi; Xu, Xingkun; Yan, Xiangrui; Bi, Feng; Wu, Weixiang . (2020). Specific surface area and electron donating capacity determine biochar's role in methane production during anaerobic digestion. Bioresource Technology, (), 122919–. doi:10.1016/j.biortech.2020.122919 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research