The Synthesis, Crystal Structure, and Magnetic Properties of Perovskites Ba3Ln2MO9 (Ln = Lanthanides; M = Mo, W)
Shigeaki Oyama, Yoshihiro Doi, Yukio Hinatsu and Yoshinobu Ishii
Bulletin of the Chemical Society of Japan v.77 (2004) , No.7 pp.1359-1366
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http://www.jstage.jst.go.jp/article/bcsj/77/7/77_1359/_article