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\bibitem{Lichtert+Verbeeck2013} {\textquotedblleft}\textit{Statistical consequences of applying a PCA noise filter on EELS spectrum images}{\textquotedblright}. Lichtert S, Verbeeck J, Ultramicroscopy \textbf{125}, 35 (2013).   http://doi.org/10.1016/j.ultramic.2012.10.001

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