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\bibitem{vandenBroek_etal2014} {\textquotedblleft}\textit{First-principles electronic functionalization of silicene and germanene by adatom chemisorption}{\textquotedblright}. van den Broek B, Houssa M, Scalise E, Pourtois G, Afanas{\textquoteright}ev VV, Stesmans A, Applied surface science \textbf{291}, 104 (2014).   http://doi.org/10.1016/j.apsusc.2013.09.032

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