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\bibitem{Francesconi_etal1998} {\textquotedblleft}\textit{Synthesis and structure of Bi14O20(SO4), a new bismuth oxide sulfate}{\textquotedblright}. Francesconi MG, Kirbyshire AL, Greaves C, Richard O, Van Tendeloo G, Chem. mater. \textbf{10}, 626 (1998).   http://doi.org/10.1021/cm9706255

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