1. O. Kahn , Molecular Magnetism , VCH , Weinheim, Germany , 1993
2. J. K. McCusker , E. A.Schmitt and D. N.Hendrickson , in Magnetic Molecular Materials , ed. D. Gatteschi , O. Khan , J. S. Miller and F. Palacio , Kluwer , Dordrecht , 1991
3. Magnetism: Molecules to Materials , ed. J. S. Miller and M. Brillon , Wiley-VCH , Weinheim, Germany , 2002
4. Magnetism: Molecules to Materials , ed. J. S. Miller and M. Brillon , Wiley-VCH , Weinheim, Germany , 2002
5. Quantum Tunneling of Magnetization and Related Phenomena in Molecular Materials