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Guillaume Jarret; José Martinez; Jean-Yves Dourmad. (2011). Pig feeding strategy coupled with effluent management – fresh or stored slurry, solid phase separation – on methane potential and methane conversion factors during storage. , 45(34), 6204–6209. doi:10.1016/j.atmosenv.2011.07.064 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research