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\bibitem{Kovnir_etal2005} {\textquotedblleft}\textit{Sn$_{19.3}$Cu$_{4.7}$As$_{22}$I$_{8}$: a new clathrate-I compound with transition-metal atoms in the cationic framework}{\textquotedblright}. Kovnir KA, Sobolev AV, Presniakov IA, Lebedev OI, Van Tendeloo G, Schnelle W, Grin Y, Shevelkov AV, Inorganic chemistry \textbf{44}, 8786 (2005).   http://doi.org/10.1021/ic051160k

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