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\bibitem{Rivera-Julio_etal2019} {\textquotedblleft}\textit{Vibrational properties of germanane and fluorinated germanene in the chair, boat, and zigzag-line configurations}{\textquotedblright}. Rivera-Julio J, Gonzalez-Garcia A, Gonzalez-Hernandez R, Lopez-Perez W, Peeters FM, Hernandez-Nieves AD, Journal of physics : condensed matter \textbf{31}, 075301 (2019).   http://doi.org/10.1088/1361-648X/AAF45F

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