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\bibitem{Nishio_etal2015} {\textquotedblleft}\textit{Low-strain Si/O superlattices with tunable electronic properties : ab initio calculations}{\textquotedblright}. Nishio K, Lu AKA, Pourtois G, Physical review : B : condensed matter and materials physics \textbf{91}, 165303 (2015).   http://doi.org/10.1103/PhysRevB.91.165303

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