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\bibitem{Paul_etal2011} {\textquotedblleft}\textit{Fe$_{3}$O$_{4}$/ZnO : a high-quality magnetic oxide-semiconductor heterostructure by reactive deposition}{\textquotedblright}. Paul M, Kufer D, M{\"u}ller A, Br{\"u}ck S, Goering E, Kamp M, Verbeeck J, Tian H, Van Tendeloo G, Ingle NJC, Sing M, Claessen R, Applied physics letters \textbf{98}, 012512 (2011).   http://doi.org/10.1063/1.3540653

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