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\bibitem{VanAert_etal2012} {\textquotedblleft}\textit{Direct observation of ferrielectricity at ferroelastic domain boundaries in CaTiO$_{3}$ by electron microscopy}{\textquotedblright}. Van Aert S, Turner S, Delville R, Schryvers D, Van Tendeloo G, Salje EKH, Advanced materials \textbf{24}, 523 (2012).   http://doi.org/10.1002/adma.201103717

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