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\bibitem{Bafekry_etal2020} {\textquotedblleft}\textit{Investigation of strain and doping on the electronic properties of single layers of C$_{6}$N$_{6}$ and C$_{6}$N$_{8}$: a first principles study}{\textquotedblright}. Bafekry A, Nguyen C V, Goudarzi A, Ghergherehchi M, Shafieirad M, Rsc Advances \textbf{10}, 27743 (2020).   http://doi.org/10.1039/D0RA04463F

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