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\bibitem{Krekels_etal1995} {\textquotedblleft}\textit{2√2 a$_{p}$ x 2√ a$_{p}$ phase in superconducting ceramics}{\textquotedblright}. Krekels T, Kaesche S, Van Tendeloo G, Physica: C : superconductivity \textbf{248}, 317 (1995).   http://doi.org/10.1016/0921-4534(95)00270-7

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