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\bibitem{Zhang_etal2008} {\textquotedblleft}\textit{First-principles study of transition metal impurities in Si}{\textquotedblright}. Zhang Z, Partoens B, Chang K, Peeters FM, Physical review : B : condensed matter and materials physics \textbf{77}, 155201 (2008).   http://doi.org/10.1103/PhysRevB.77.155201

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