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\bibitem{Kovalevsky_etal2011} {\textquotedblleft}\textit{Oxygen exchange-limited transport and surface activation of Ba$_{0.5}$Sr$_{0.5}$Co$_{0.8}$Fe$_{0.2}$O$_{3-\delta}$ capillary membranes}{\textquotedblright}. Kovalevsky A, Buysse C, Snijkers F, Buekenhoudt A, Luyten J, Kretzschmar J, Lenaerts S, Journal of membrane science \textbf{368}, 223 (2011).   http://doi.org/10.1016/J.MEMSCI.2010.11.034

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