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\bibitem{Mueller_etal2014} {\textquotedblleft}\textit{Atomic electric fields revealed by a quantum mechanical approach to electron picodiffraction}{\textquotedblright}. Mueller K, Krause FF, B{\'e}ch{\'e} A, Schowalter M, Galioit V, Loeffler S, Verbeeck J, Zweck J, Schattschneider P, Rosenauer A, Nature communications \textbf{5}, 5653 (2014).   http://doi.org/10.1038/ncomms6653

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