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\bibitem{Zhu_etal2013} {\textquotedblleft}\textit{Plasmonic excitations in Coulomb-coupled N-layer graphene structures}{\textquotedblright}. Zhu J-J, Badalyan SM, Peeters FM, Physical review : B : condensed matter and materials physics \textbf{87}, 085401 (2013).   http://doi.org/10.1103/PhysRevB.87.085401

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