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López, J.; Reig, M.; Gibert, O.; Cortina, J.L. . (2018). Integration of Nanofiltration membranes in recovery options of rare earth elements from acidic mine waters. Journal of Cleaner Production, (), S0959652618335005–. doi:10.1016/j.jclepro.2018.11.096 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research