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\bibitem{Horzum_etal2016} {\textquotedblleft}\textit{Structural, electronic and optical properties of Cu-doped ZnO : experimental and theoretical investigation}{\textquotedblright}. Horzum S, Torun E, Serin T, Peeters FM, Philosophical magazine \textbf{96}, 1743 (2016).   http://doi.org/10.1080/14786435.2016.1177224

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