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\bibitem{Neek-Amal+Peeters2010} {\textquotedblleft}\textit{Defected graphene nanoribbons under axial compression}{\textquotedblright}. Neek-Amal M, Peeters FM, Applied physics letters \textbf{97}, 153118 (2010).   http://doi.org/10.1063/1.3496467

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