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Maruyama, Satoshi; Kodama, Takahiro; Kobayashi, Makoto . (1988). Oxygen Content and Transition Temperature ( <i>T</i> <sub/>c</sub> ) in Ba <sub/> 2- <i>x</i> </sub> Ln <sub/> 1+ <i>x</i> </sub> Cu <sub/>3</sub> O <sub/>7-δ</sub> (Ln=Sm, Eu). Japanese Journal of Applied Physics, 27(Part 2, No. 12), L2274–L2275. doi:10.1143/JJAP.27.L2274 
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