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\bibitem{Mallick_etal2022} {\textquotedblleft}\textit{The crystal and defect structures of polar KBiNb$_{2}$O$_{7}$}{\textquotedblright}. Mallick S, Zhang W, Batuk M, Gibbs AS, Hadermann J, Halasyamani PS, Hayward MA, Journal of the Chemical Society : Dalton transactions \textbf{51}, 1866 (2022).   http://doi.org/10.1039/D1DT04064B

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