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\bibitem{Shylau_etal2015} {\textquotedblleft}\textit{Electron polarization function and plasmons in metallic armchair graphene nanoribbons}{\textquotedblright}. Shylau AA, Badalyan SM, Peeters FM, Jauho AP, Physical review : B : condensed matter and materials physics \textbf{91}, 205444 (2015).   http://doi.org/10.1103/PhysRevB.91.205444

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