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\bibitem{vandenBroek_etal2014} {\textquotedblleft}\textit{Two-dimensional hexagonal tin : ab initio geometry, stability, electronic structure and functionalization}{\textquotedblright}. van den Broek B, Houssa M, Scalise E, Pourtois G, Afanas{\textquoteright}ev VV, Stesmans A, 2D materials \textbf{1}, 021004 (2014).   http://doi.org/10.1088/2053-1583/1/2/021004

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