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\bibitem{Tan_etal2011} {\textquotedblleft}\textit{2D atomic mapping of oxidation states in transition metal oxides by scanning transmission electron microscopy and electron energy-loss spectroscopy}{\textquotedblright}. Tan H, Turner S, Y{\"u}celen E, Verbeeck J, Van Tendeloo G, Physical review letters \textbf{107}, 107602 (2011).   http://doi.org/10.1103/PhysRevLett.107.107602

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