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\bibitem{Yan_etal2011} {\textquotedblleft}\textit{Cation ordering within the perovskite block of a six-layer Ruddlesden-Popper oxide from layer-by-layer growth artificial interfaces in complex unit cells}{\textquotedblright}. Yan L, Niu HJ, Duong GV, Suchomel MR, Bacsa J, Chalker PR, Hadermann J, Van Tendeloo G, Rosseinsky MJ, Chemical science \textbf{2}, 261 (2011).   http://doi.org/10.1039/c0sc00482k

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