1. J. S. Miller, J. C. Calabrese, H. Rommelmann, S. R. Chittipeddi, J. H. Zhang, W. M. Reiff, and A. J. Epstein, J. Am. Chem. Soc.
109, 768 (1987).
2. M. Nakano and M. Sorai, Chem. Phys. Lett.
169, 27 (1990).
3. J. S. Miller and D. Dougherty (eds.), Proceedings of the International Symposium on High Spin Molecular Based Materials, Mol. Cryst. Liq. Cryst. 176 (1989).
4. J. S. Griffith, Nature
180, 30 (1957).
5. J. S. Griffith, Mol. Phys.
21, 135 (1971).