1. a) Martin RL, White AH (1968) In: Carlin RL (ed) Transition metal chemistry, vol. 4. Marcel Dekker, p. 113; b) Goodwin HA (1976) Coord Chem Rev 18:293; c) Gütlich P (1981) Struct Bond 44:83; d) König E (1987) Progr Inorg Chem 35:527
2. a) Beattie JK (1988) Adv Inorg Chem 32:1; b) Bacci M (1988) Coord Chem Rev 86:245; c) König E (1991) Struct Bond 76:51; d) Toftlund H (1989) Coord Chem Rev 97:67
3. a) Lawthers I, McGarvey JJ (1984) J Am Chem Soc 106:4280; b) McGarvey JJ, Lawthers I (1982) J Chem Soc Chem Comm 1982:906
4. a) Decurtins S, Gütlich P, Köhler CP, Spiering H, Hauser A (1984) Chem Phys Lett 13:1; b) Decurtins S, Gütlich P, Hasselbach KM, Spiering H, Hauser A (1985) Inorg Chem 24:2174
5. a) Hauser A (1986) Chem Phys Lett 124:543; b) Hauser A (1991) J Chem Phys 94:2741