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\bibitem{Houssa_etal2014} {\textquotedblleft}\textit{Theoretical aspects of graphene-like group IV semiconductors}{\textquotedblright}.  Houssa M, van den Broek B, Scalise E, Ealet B, Pourtois G, Chiappe D, Cinquanta E, Grazianetti C, Fanciulli M, Molle A, Afanas{\textquoteright}ev VV, Stesmans A;, Applied surface science \textbf{291}, 98 (2014).   http://doi.org/10.1016/j.apsusc.2013.09.062

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