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\bibitem{Abreu_etal2014} {\textquotedblleft}\textit{DFT study of the hyperfine parameters and magnetic properties of ZnO doped with $^{57}$Fe}{\textquotedblright}. Abreu Y, Cruz CM, Pinera I, Leyva A, Cabal AE, van Espen P, Solid state communications \textbf{185}, 25 (2014).   http://doi.org/10.1016/J.SSC.2014.01.010

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