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\bibitem{Lei+VanTendeloo2002} {\textquotedblleft}\textit{Anisotropic BaTiO$_{3}$ thin films grown on MgO-buffered R-plane sapphire}{\textquotedblright}. Lei CH, Van Tendeloo G, Philosophical magazine letters \textbf{82}, 433 (2002).   http://doi.org/10.1080/09500830210144373

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