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\bibitem{deFontaine_etal1992} {\textquotedblleft}\textit{On the asymmetric next-nearest-neighbor ising model of oxygen ordering in YBa$_{2}$Cu$_{3}$O$_{z}$}{\textquotedblright}. de Fontaine D, Asta M, Ceder G, McCormack R, Van Tendeloo G, Europhysics letters \textbf{19}, 229 (1992).   http://doi.org/10.1209/0295-5075/19/3/013

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