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Bai, M.J.; Niu, Y.N.; Xu, E.S.; Xu, Y. . (2014). Economic Analysis of Vacuum Transfer Tube for Conveying Working Medium of CSP. Energy Procedia, 49(), 1664–1672. doi:10.1016/j.egypro.2014.03.175 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research