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Martins, S.; Tho, I.; Ferreira, D.C.; Souto, E.B.; Brandl, M.. (2011). Physicochemical properties of lipid nanoparticles: Effect of lipid and surfactant composition. , 37(7), 815–824. doi:10.3109/03639045.2010.545414 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research