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\bibitem{Burriel_etal2007} {\textquotedblleft}\textit{Enhanced high-temperature electronic transport properties in nanostructured epitaxial thin films of the La$_{n+1}$Ni$_{n}$O$_{3n+1}$ Ruddlesden-Popper series (n = 1, 2, 3, $\infty$)}{\textquotedblright}. Burriel M, Garcia G, Rossell MD, Figueras A, Van Tendeloo G, Santiso J, Chemistry of materials \textbf{19}, 4056 (2007).   http://doi.org/10.1021/cm070804e

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