1. K. Bizot and J. H. Enemark,J. Chem. Educ., 56, 70 (1979).
2. F. A. Cotton and G. Wilkinson,Advanced Inorganic Chemistry, 4th Edit., John Wiley and Sons, New York, 1980, p. 852.
3. J. Beltrán, A. Cervilla and A. Beltrán,An. Quim., 75, 191 (1979).
4. A. Cervilla, A. Beltrán and J. Beltrán,Can. J. Chem., 57, 773 (1979).
5. F. Caturla,Doctoral Thesis, Univ. Alicante, Spain (1982).