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\bibitem{Neek-Amal+Peeters2011} {\textquotedblleft}\textit{Buckled circular monolayer graphene : a graphene nano-bowl}{\textquotedblright}. Neek-Amal M, Peeters FM, Journal of physics : condensed matter \textbf{23}, 045002 (2011).   http://doi.org/10.1088/0953-8984/23/4/045002

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