1. M. Yamaguchi, I. Yamamoto, Dynamic Spin Chemistry (S. Nagakura, H. Hayashi, T. Azumi, eds.), Chapt. 5, Kodansha/Wiley, Tokyo (1998).
2. M. Yamaguchi, S. Ozeki, Bunshi Jisei (K. Itoh, ed.), p.448, Gakkai Shuppan Center, Tokyo (1996) (in Japanese).
3. F. A. Kuijpers, Phillips Res. Rept. Suppl., 2, 1 (1973).
4. M. Yamaguchi, I. Yamamoto, F. Ishikawa, T. Goto, S. Miura, J. Alloys. Compd., 253/254, 191 (1997).
5. F. A. Kuijpers, J. Less-Common Met., 27. 27 (1971).