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\bibitem{Chen_etal2021} {\textquotedblleft}\textit{Two-dimensional oxygen functionalized honeycomb and zigzag dumbbell silicene with robust Dirac cones}{\textquotedblright}. Chen X, Li L, Peeters FM, Sanyal B, New Journal Of Physics \textbf{23}, 023007 (2021).   http://doi.org/10.1088/1367-2630/ABDB6E

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