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Sugiyama, K., Matsubara, E., Waseda, Y. et al. Direct estimation of local environmental structure around copper in superconducting oxides of Ba2 YCu3O7−x . J Mater Sci Lett 7, 450–452 (1988). https://doi.org/10.1007/BF01730685
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DOI: https://doi.org/10.1007/BF01730685