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\bibitem{Matulis_etal2015} {\textquotedblleft}\textit{Wave fronts and packets in 1D models of different meta-materials : graphene, left-handed media and transmission line}{\textquotedblright}. Matulis A, Zarenia M, Peeters FM, Physica status solidi: B: basic research \textbf{252}, 2330 (2015).   http://doi.org/10.1002/pssb.201552023

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