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\bibitem{Matulis+Peeters2009} {\textquotedblleft}\textit{Analogy between one-dimensional chain models and graphene}{\textquotedblright}. Matulis A, Peeters FM, American journal of physics \textbf{77}, 595 (2009).   http://doi.org/10.1119/1.3127143

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