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\bibitem{Han_etal2020} {\textquotedblleft}\textit{Universal a-cation splitting in LiNbO$_{3}$-type structure driven by intrapositional multivalent coupling}{\textquotedblright}. Han Y, Zeng Y, Hendrickx M, Hadermann J, Stephens PW, Zhu C, Grams CP, Hemberger J, Frank C, Li S, Wu MX, Retuerto M, Croft M, Walker D, Yao D-X, Greenblatt M, Li M-R, Journal Of The American Chemical Society \textbf{142}, 7168 (2020).   http://doi.org/10.1021/JACS.0C01814

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