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\bibitem{Sena_etal2012} {\textquotedblleft}\textit{The electronic properties of graphene and graphene ribbons under simple shear strain}{\textquotedblright}. Sena SHR, Pereira JM, Farias GA, Peeters FM, Costa Filho RN, Journal of physics : condensed matter \textbf{24}, 375301 (2012).   http://doi.org/10.1088/0953-8984/24/37/375301

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