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\bibitem{Mueller-Caspary_etal2019} {\textquotedblleft}\textit{Electrical Polarization in AlN/GaN Nanodisks Measured by Momentum-Resolved 4D Scanning Transmission Electron Microscopy}{\textquotedblright}. M{\"u}ller-Caspary K, Grieb T, M{\"u}{\ss}ener J, Gauquelin N, Hille P, Sch{\"o}rmann J, Verbeeck J, Van Aert S, Eickhoff M, Rosenauer A, Physical review letters \textbf{122}, 106102 (2019).   http://doi.org/10.1103/PhysRevLett.122.106102

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