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\bibitem{Zhao_etal2014} {\textquotedblleft}\textit{Plasmon and coupled plasmon-phonon modes in graphene in the presence of a driving electric field}{\textquotedblright}. Zhao CX, Xu W, Dong HM, Peeters FM, Physical review : B : condensed matter and materials physics \textbf{89}, 195447 (2014).   http://doi.org/10.1103/PhysRevB.89.195447

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