References
- Takagi , Y. and Makita , Y. 1958 . J. Phys. Soc. Japan , 13 : 272
- Sawada , A. and Takagi , Y. 1971 . J. Phys. Soc. Japan , 31 : 952
- Iizumi , M. and Gesi , K. 1978 . J. Phys. Soc. Japan , 45 : 711
- Brozek , Z. and Stadnicka , K. 1994 . Acta Cryst. B , 50 : 59
- Kikuta , T. to be published