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\bibitem{Samal_etal2014} {\textquotedblleft}\textit{Direct structural and spectroscopic investigation of ultrathin films of tetragonal CuO: Six-fold coordinated copper}{\textquotedblright}. Samal D, Tan H, Takamura Y, Siemons W, Verbeeck J, Van Tendeloo G, Arenholz E, Jenkins CA, Rijnders G, Koster G, Europhysics letters \textbf{105}, 17003 (2014).   http://doi.org/10.1209/0295-5075/105/17003

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