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\bibitem{Tobias_etal2004} {\textquotedblleft}\textit{Anion ordering and defect structure in Ruddlesden-Popper strontium niobium oxynitrides}{\textquotedblright}. Tob{\'\i}as G, Beltr{\'a}n-Porter D, Lebedev OI, Van Tendeloo G, Rodr{\'\i}guez-Carvajal J, Fuertes A, Inorganic chemistry \textbf{43}, 8010 (2004).   http://doi.org/10.1021/ic049236k

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