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Benjamin Ohnmacht;Andreas Lemmer;Hans Oechsner;Philipp Kress;. (2021). Demand-oriented biogas production and biogas storage in digestate by flexibly feeding a full-scale biogas plant . Bioresource Technology, (), –. doi:10.1016/j.biortech.2021.125099 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research