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\bibitem{Neek-Amal+Peeters2010} {\textquotedblleft}\textit{Nanoindentation of a circular sheet of bilayer graphene}{\textquotedblright}. Neek-Amal M, Peeters FM, Physical review : B : condensed matter and materials physics \textbf{81}, 235421 (2010).   http://doi.org/10.1103/PhysRevB.81.235421

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