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\bibitem{Li_etal2017} {\textquotedblleft}\textit{Carbon-rich carbon nitride monolayers with Dirac cones : Dumbbell C$_{4}$N}{\textquotedblright}. Li L, Kong X, Leenaerts O, Chen X, Sanyal B, Peeters FM, Carbon \textbf{118}, 285 (2017).   http://doi.org/10.1016/J.CARBON.2017.03.045

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