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\bibitem{Milat_etal1993} {\textquotedblleft}\textit{Ordering principles for tetrahedral chains in Ga- and Co-substituted YBCO intergrowths}{\textquotedblright}. Milat O, Krekels T, Van Tendeloo G, Amelinckx S, Journal de physique: 1: physique g{\'e}n{\'e}rale, physique statistique, mati{\`e}re condens{\'e}e, domaines interdisciplinaires \textbf{3}, 1219 (1993)

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