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H. Maeda; Y. Tanaka; M. Fukutumi; T. Asano (1988). «A New High-Tc Oxide Superconductor without a Rare Earth Element». Jpn. J. Appl. Phys.27 (2): L209-L210. Bibcode:1988JaJAP..27L.209M. doi:10.1143/JJAP.27.L209.