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\bibitem{Bontchev_etal1993} {\textquotedblleft}\textit{New cation deficient perovskite-like oxides in the system La$_{4}$Ti$_{3}$O$_{12}$-LaTiO$_{3}$}{\textquotedblright}. Bontchev R, Darriet B, Darriet J, Weill F, Van Tendeloo G, Amelinckx S, European journal of solid state and inorganic chemistry \textbf{30}, 521 (1993)

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