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\bibitem{Oro-Sole_etal2006} {\textquotedblleft}\textit{Crystal structures of superconducting sodium intercalates of hafnium nitride chloride}{\textquotedblright}. Or{\'o}-Sol{\'e} J, Frontera C, Beltr{\'a}n-Porter D, Lebedev OI, Van Tendeloo G, Fuertes A, Materials research bulletin \textbf{41}, 934 (2006).   http://doi.org/10.1016/j.materresbull.2006.03.018

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