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Rampino, S.; Pattini, F.; Malagù, C.; Pozzetti, L.; Stefancich, M.; Bronzoni, M. . (2014). Application of a substrate bias to control the droplet density on Cu(In,Ga)Se2 thin films grown by Pulsed Electron Deposition. Thin Solid Films, 562(), 307–313. doi:10.1016/j.tsf.2014.04.091 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research