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Lundeberg, Mark B.; Gao, Yuanda; Woessner, Achim; Tan, Cheng; Alonso-González, Pablo; Watanabe, Kenji; Taniguchi, Takashi; Hone, James; Hillenbrand, Rainer; Koppens, Frank H. L. . (2016). Thermoelectric detection and imaging of propagating graphene plasmons. Nature Materials, (), –. doi:10.1038/nmat4755 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research