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Lavat, A.E., Trezza, M. & Baran, E.J. A comparative infrared spectroscopic study of electronic superconductors of the type Ln2−x MIV x CuO4−y . J Mater Sci Lett 12, 923–925 (1993). https://doi.org/10.1007/BF00455620
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DOI: https://doi.org/10.1007/BF00455620