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\bibitem{Tassin_etal2012} Tassin, P., Koschny, T., Kafesaki, M., \& Soukoulis, C. M. (2012). A comparison of graphene, superconductors and metals as conductors for metamaterials and plasmonics. \textit{Nat. Photon.}, \textit{6}(4), 259--264.

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