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\bibitem{Kang_etal2015} {\textquotedblleft}\textit{Heterostructures of graphene and nitrogenated holey graphene: Moire pattern and Dirac ring}{\textquotedblright}. Kang J, Horzum S, Peeters FM, Physical review : B : condensed matter and materials physics \textbf{92}, 195419 (2015).   http://doi.org/10.1103/PhysRevB.92.195419

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