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\bibitem{Krehl_etal2018} {\textquotedblleft}\textit{Spectral field mapping in plasmonic nanostructures with nanometer resolution}{\textquotedblright}. Krehl J, Guzzinati G, Schultz J, Potapov P, Pohl D, Martin J, Verbeeck J, Fery A, B{\"u}chner B, Lubk A, Nature communications \textbf{9}, 4207 (2018).   http://doi.org/10.1038/s41467-018-06572-9

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