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\bibitem{Lebedev_etal2002} {\textquotedblleft}\textit{The crystal structure of YSr$_{2}$Cu$_{3}$O$_{6+x}$ determined by HREM}{\textquotedblright}. Lebedev O, Van Tendeloo G, Marezio M, Licci F, Gilioli E, Gauzzi A, Prodi A s.l., page 877 (2002).

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