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\bibitem{Sivek_etal2012} {\textquotedblleft}\textit{First-principles investigation of bilayer fluorographene}{\textquotedblright}. Sivek J, Leenaerts O, Partoens B, Peeters FM, The journal of physical chemistry: C : nanomaterials and interfaces \textbf{116}, 19240 (2012).   http://doi.org/10.1021/jp3027012

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