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\bibitem{Abakumov_etal2013} {\textquotedblleft}\textit{Frustrated octahedral tilting distortion in the incommensurately modulated Li$_{3x}$Nd$_{2/3-x}$TiO$_{3}$ perovskites}{\textquotedblright}. Abakumov AM, Erni R, Tsirlin AA, Rossell MD, Batuk D, N{\'e}nert G, Van Tendeloo G, Chemistry of materials \textbf{25}, 2670 (2013).   http://doi.org/10.1021/cm4012052

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