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Suryanarayanan, R., Rao, M.S.R., Ouhammou, L. et al. Microstructure and superconducting properties of Y1−y Ca y BaSrCu3−x Al x O z (y=0 and 0.2,x=0 and 0.1). J Mater Sci Lett 10, 1421–1424 (1991). https://doi.org/10.1007/BF00724395
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DOI: https://doi.org/10.1007/BF00724395