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\bibitem{Scalise_etal2013} {\textquotedblleft}\textit{Vibrational properties of silicene and germanene}{\textquotedblright}. Scalise E, Houssa M, Pourtois G, van den Broek B, Afanas{\textquoteright}ev V, Stesmans A, Nano Research \textbf{6}, 19 (2013).   http://doi.org/10.1007/s12274-012-0277-3

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