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Koo, H.S., Wu, P.T., Chen, F.H. et al. Preparation and properties of gel-derived high-T c YBa2Cu3O7−x superconductor. J Mater Sci Lett 9, 807–809 (1990). https://doi.org/10.1007/BF00720165
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DOI: https://doi.org/10.1007/BF00720165