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\bibitem{Lazoryak_etal2003} {\textquotedblleft}\textit{Ferroelectric and ionic-conductive properties of nonlinear-optical vanadate, Ca$_{9}$Bi(VO$_{4}$)$_{7}$}{\textquotedblright}. Lazoryak BI, Baryshnikova OV, Stefanovich SY, Malakho AP, Morozov VA, Belik AA, Leonidov IA, Leonidova ON, Van Tendeloo G, Chemistry of materials \textbf{15}, 3003 (2003).   http://doi.org/10.1021/cm031043s

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