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\bibitem{Bach_etal2006} {\textquotedblleft}\textit{EELS investigations of different niobium oxide phases}{\textquotedblright}. Bach D, St{\"o}rmer H, Schneider R, Gerthsen D, Verbeeck J, Microscopy and microanalysis \textbf{12}, 416 (2006).   http://doi.org/10.1017/S1431927606060521

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