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\bibitem{Volodin_etal2017} {\textquotedblleft}\textit{Stress dependence of the suspended graphene work function : vacuum Kelvin probe force microscopy and density functional theory}{\textquotedblright}. Volodin A, Van Haesendonck C, Leenaerts O, Partoens B, Peeters FM, Applied physics letters \textbf{110}, 193101 (2017).   http://doi.org/10.1063/1.4982931

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