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\bibitem{Zhang_etal1993} {\textquotedblleft}\textit{Two phase intergrowth in Bi$_{2}$Sr$_{2}$Ca$_{0.6}$Y$_{0.4}$Cu$_{2}$O$_{y}$ single crystals}{\textquotedblright}. Zhang XF, Van Tendeloo G, Ge SL, Emmen JHPM, Brabers VAM, Physica: C : superconductivity \textbf{215}, 39 (1993).   http://doi.org/10.1016/0921-4534(93)90362-T

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