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\bibitem{Zhao_etal2013} {\textquotedblleft}\textit{Cerenkov emission of terahertz acoustic-phonons from graphene}{\textquotedblright}. Zhao CX, Xu W, Peeters FM, Applied physics letters \textbf{102}, 222101 (2013).   http://doi.org/10.1063/1.4808392

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