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\bibitem{Belik_etal2017} {\textquotedblleft}\textit{Antiferroelectric properties and site occupations ofR$^{3+}$ cations in Ca$_{8}$MgR(PO$_{4}$)$_{7}$ luminescent host materials}{\textquotedblright}. Belik AA, Morozov VA, Deyneko DV, Savon AE, Baryshnikova OV, Zhukovskaya ES, Dorbakov NG, Katsuya Y, Tanaka M, Stefanovich SY, Hadermann J, Lazoryak BI, Journal of alloys and compounds \textbf{699}, 928 (2017).   http://doi.org/10.1016/J.JALLCOM.2016.12.288

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