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\bibitem{Bach_etal2009} {\textquotedblleft}\textit{EELS of niobium and stoichiometric niobium-oxide phases: part 1: plasmon and Near-edges fine structure}{\textquotedblright}. Bach D, Schneider R, Gerthsen D, Verbeeck J, Sigle W, Microscopy and microanalysis \textbf{15}, 505 (2009).   http://doi.org/10.1017/S143192760999105X

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