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\bibitem{Krstajic_etal2004} {\textquotedblleft}\textit{Double-exchange mechanisms for Mn-doped III-V ferromagnetic semiconductors}{\textquotedblright}. Krstaji{\'c} PM, Peeters FM, Ivanov VA, Fleurov V, Kikoin K, Physical review : B : condensed matter and materials physics \textbf{70}, 195215 (2004).   http://doi.org/10.1103/PhysRevB.70.195215

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