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\bibitem{Houssa_etal2011} {\textquotedblleft}\textit{Electronic properties of hydrogenated silicene and germanene}{\textquotedblright}. Houssa M, Scalise E, Sankaran K, Pourtois G, Afanas{\textquoteright}ev VV, Stesmans A, Applied physics letters \textbf{98}, 223107 (2011).   http://doi.org/10.1063/1.3595682

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