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\bibitem{Kirsanova_etal2011} {\textquotedblleft}\textit{Extension of the clathrate family : the type X clathrate Ge$_{79}$P$_{29}$S$_{18}$Te$_{6}$}{\textquotedblright}. Kirsanova MA, Olenev AV, Abakumov AM, Bykov MA, Shevelkov AV, Angewandte Chemie: international edition in English \textbf{50}, 2371 (2011).   http://doi.org/10.1002/anie.201007483

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