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\bibitem{Daniel_etal1994} {\textquotedblleft}\textit{Mixed valent iron oxides with the 0201-1201 intergrowth structure: (Pb$_{1-x}$Tl$_{x}$)Sr$_{4}$Fe$_{2}$O$_{9}$ (0<=x<=1)}{\textquotedblright}. Daniel P, Barbey L, Groult D, Nguyen N, Van Tendeloo G, Raveau B, European journal of solid state and inorganic chemistry \textbf{31}, 235 (1994)

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