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\bibitem{Burriel_etal2008} {\textquotedblleft}\textit{Enhancing total conductivity of La$_{2}$NiO$_{4+\delta}$ epitaxial thin films by reducing thickness}{\textquotedblright}. Burriel M, Santiso J, Rossell MD, Van Tendeloo G, Figueras A, Garcia G, The journal of physical chemistry: C : nanomaterials and interfaces \textbf{112}, 10982 (2008).   http://doi.org/10.1021/jp7101622

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