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Ma, Yanli; Dai, Junxiu; Wu, Lili; Fang, Guizhen; Guo, Zhanhu . (2017). Enhanced anti-ultraviolet, anti-fouling and anti-bacterial polyelectrolyte membrane of polystyrene grafted with trimethyl quaternary ammonium salt modified lignin. Polymer, 114(), 113–121. doi:10.1016/j.polymer.2017.02.083 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research