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2. Y. Waku, T. Yamamoto, M. Suzuki, T. Nagasawa and T. Nishi, Tetsu-to-Hagane
75 (1989) 1563.
3. Y. Waku, T. Yamamoto, M. Suzuki, M. Tokuse, T. Nagasawa and T. Nishi, in Proceedings of the 34th International SAMPE Symposium and Exhibition (1989) 2278.
4. M. Cooper and K. Robinson, Acta Cryst.
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5. M. Cooper, ibid.
23 (1967) 1106.