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\bibitem{Neek-Amal_etal2012} {\textquotedblleft}\textit{Nanoengineered nonuniform strain in graphene using nanopillars}{\textquotedblright}. Neek-Amal M, Covaci L, Peeters FM, Physical review : B : condensed matter and materials physics \textbf{86}, 041405 (2012).   http://doi.org/10.1103/PhysRevB.86.041405

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