1. Martin, R.L. and White, A.H., Transition Metal Chemistry, New York: Dekker, 1968, vol. 4, p. 113.
2. Goodwin, H.A., Coord. Chem. Rev., 1976, vol. 18, p. 293.
3. Gutlich, P., Struct. Bond, 1981, vol. 44, p. 83.
4. König, E., Prog. Inorg. Chem., 1987, vol. 35, p. 527.
5. Beattie, J.K., Adv. Inorg. Chem., 1988, vol. 32, p. 1.