1. R. H. Holm, G. W. Everett Jr. and A. Chakrovorty,Progr. Inorg. Chem., 7, 83 (1966).
2. U. Casellato, P. A. Vigato and M. Vidali,Coord. Chem. Rev., 23, 31 (1977).
3. B. O. West,New Pathways in Inorganic Chemistry, Univ. Press, Cambridge (1968).
4. S. E. Groh,Israel J. Chem., 15, 277 (1976/77).
5. P. K. Bhattacharya,J. Indian Chem. Soc., 59, 505 (1982).