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\bibitem{Covaci+Berciu2008} {\textquotedblleft}\textit{Survival of the Dirac points in rippled graphene}{\textquotedblright}. Covaci L, Berciu M, Physical Review Letters \textbf{100}, 256405 (2008).   http://doi.org/10.1103/PhysRevLett.100.256405

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