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\bibitem{VanDuppen_etal2014} {\textquotedblleft}\textit{Spin and valley polarization of plasmons in silicene due to external fields}{\textquotedblright}. Van Duppen B, Vasilopoulos P, Peeters FM, Physical review : B : condensed matter and materials physics \textbf{90}, 035142 (2014).   http://doi.org/10.1103/PhysRevB.90.035142

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