1. K. B. Yatsimirskii, E. E. Kriss, A. S. Grigor'eva, et al., Khim.-Farm. Zh., No. 1, 53 (1976).
2. M. M. Khan and A. E. Martell, J. Am. Chem. Soc.,89, 4176 (1967).
3. H. Sigel, Angew. Chem.,81, 161 (1969).
4. E. E. Kriss, A. S. Grigor'eva, and K. B. Yatsimirskii, Zh. Neorg. Khim.,20 1294 (1975).
5. A. Al'bert and E. Serzhent, Ionization Constants of Acids and Bases [in Russian], Moscow-Leningrad (1964).