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\bibitem{Pandey_etal2021} {\textquotedblleft}\textit{Tuning flexoelectricty and electronic properties of zig-zag graphene nanoribbons by functionalization}{\textquotedblright}. Pandey T, Covaci L, Peeters FM, Carbon \textbf{171}, 551 (2021).   http://doi.org/10.1016/J.CARBON.2020.09.028

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