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\bibitem{Zelonka_etal2006} {\textquotedblleft}\textit{Hydrothermal processing of barium strontium titanate sol-gel composite thin films}{\textquotedblright}. Zelonka K, Sayer M, Freundorfer AP, Hadermann J, Journal of materials science \textbf{41}, 3885 (2006).   http://doi.org/10.1007/s10853-005-5525-4

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