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Dessbesell, Luana; Paleologou, Michael; Leitch, Mathew; Pulkki, Reino; Xu, Chunbao (Charles) . (2020). Global lignin supply overview and kraft lignin potential as an alternative for petroleum-based polymers. Renewable and Sustainable Energy Reviews, 123(), 109768–. doi:10.1016/j.rser.2020.109768 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research