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Butt, Hans-Jürgen; Untch, Maria B.; Golriz, Ali; Pihan, Sascha A.; Berger, Rüdiger . (2011). Electric-field-induced condensation: An extension of the Kelvin equation. Physical Review E, 83(6), 061604–. doi:10.1103/PhysRevE.83.061604 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research