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\bibitem{Papp_etal2005} {\textquotedblleft}\textit{Spin transport in a Mn-doped ZnSe asymmetric tunnel structure}{\textquotedblright}. Papp G, Borza S, Peeters FM, Journal of applied physics \textbf{97}, 113901 (2005).   http://doi.org/10.1063/1.1861520

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