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\bibitem{Du_etal2020} {\textquotedblleft}\textit{Direct visualization of irreducible ferrielectricity in crystals}{\textquotedblright}. Du K, Guo L, Peng J, Chen X, Zhou Z-N, Zhang Y, Zheng T, Liang Y-P, Lu J-P, Ni Z-H, Wang S-S, Van Tendeloo G, Zhang Z, Dong S, Tian H, npj Quantum Materials \textbf{5}, 49 (2020).   http://doi.org/10.1038/S41535-020-00252-Y

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