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\bibitem{Lei_etal2001} {\textquotedblleft}\textit{Growth kinetic of MgO film on \textbf{r}-plane of sapphire: microstructural study}{\textquotedblright}. Lei CH, Van Tendeloo G, Lisoni JG, Siegert M, Schubert J, Journal of crystal growth \textbf{226}, 419 (2001).   http://doi.org/10.1016/S0022-0248(01)01396-3

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