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\bibitem{Noren_etal2001} {\textquotedblleft}\textit{The real (incommensurate interface modulated) structure of Ni$_{6\pm x}$Se$_{5}$}{\textquotedblright}. Nor{\'e}n L, Van Tendeloo G, Withers RL, Journal of solid state chemistry \textbf{162}, 122 (2001).   http://doi.org/10.1006/jssc.2001.9365

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