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Hegde, Ravi S.; Hor, Yew Li; Hoefer, Wolfgang J. R. . (2015). A spatial filter bank model of the Veselago–Pendry superlens. Applied Physics A, 120(1), 25–33. doi:10.1007/s00339-015-9152-x 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research