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\bibitem{Xiao_etal2014} {\textquotedblleft}\textit{Infrared to terahertz absorption window in mono- and multi-layer graphene systems}{\textquotedblright}. Xiao YM, Xu W, Peeters FM, Optics communications \textbf{328}, 135 (2014).   http://doi.org/10.1016/j.optcom.2014.04.079

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