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Rinaldi, Roberto; Jastrzebski, Robin; Clough, Matthew T.; Ralph, John; Kennema, Marco; Bruijnincx, Pieter C. A.; Weckhuysen, Bert M. . (2016). Paving the Way for Lignin Valorisation: Recent Advances in Bioengineering, Biorefining and Catalysis. Angewandte Chemie International Edition, 55(29), 8164–8215. doi:10.1002/anie.201510351 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research