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\bibitem{Moldovan_etal2013} {\textquotedblleft}\textit{Electronic states in a graphene flake strained by a Gaussian bump}{\textquotedblright}. Moldovan D, Masir MR, Peeters FM, Physical review : B : condensed matter and materials physics \textbf{88}, 035446 (2013).   http://doi.org/10.1103/PhysRevB.88.035446

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