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\bibitem{N.Gauquelin2014} {\textquotedblleft}\textit{Atomic scale real-space mapping of holes in YBa2Cu3O6+δ}{\textquotedblright}. N Gauquelin D G Hawthorn G A Sawatzky R X Liang D A Bonn W N Hardy~\& GA Botton, Nature Communications \textbf{5}, 4275 (2014).   http://doi.org/10.1038/ncomms5275

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