1. A. F. Shestakov and A. L. Buchachenko, Dokl. Akad. Nauk SSSR 310, 407 (1990).
2. A. L. Buchachenko, Usp. Khim. 59, 529 (1990).
3. Molecular Magnetism, Ed. by K. Iton and M. Kinoshita (Kodansha, Tokyo, 2000).
4. V. I. Ovcharenko and R. Z. Sagdeev, Usp. Khim. 68, 381 (1999).
5. O. Kahn, Molecular Magnetism (VCH, New York, 1993).