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Tasolamprou, Anna C; Koulouklidis, Anastasios D; Daskalaki, Christina; Mavidis, Charalampos P; Kenanakis, George; Deligeorgis, George; Viskadourakis, Zacharias; Kuzhir, Polina; Tzortzakis, Stelios; Kafesaki, Maria; Economou, Eleftherios N.; Soukoulis, Costas M. . (2019). Experimental demonstration of ultrafast THz modulation in a graphene-based thin film absorber through negative photoinduced conductivity. ACS Photonics, (), acsphotonics.8b01595–. doi:10.1021/acsphotonics.8b01595 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research