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\bibitem{Neek-Amal+Peeters2012} {\textquotedblleft}\textit{Effect of grain boundary on the buckling of graphene nanoribbons}{\textquotedblright}. Neek-Amal M, Peeters FM, Applied physics letters \textbf{100}, 101905 (2012).   http://doi.org/10.1063/1.3692573

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