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\bibitem{deOliveira_etal2012} {\textquotedblleft}\textit{Configuration-interaction excitonic absorption in small Si/Ge and Ge/Si core/shell nanocrystals}{\textquotedblright}. de Oliveira EL, Albuquerque EL, de Sousa JS, Farias GA, Peeters FM, The journal of physical chemistry: C : nanomaterials and interfaces \textbf{116}, 4399 (2012).   http://doi.org/10.1021/jp2088516

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