1. Rusina, A., Ph.D. thesis, Polarographic Institute, Prague (1965).
2. Rusina, A., and VIček, A. A., Proc. Symp. Structure and Properties of Coordination Compounds, 65 (Bratislava, September 1964).
3. Vallarino, L., J. Chem., 2287 (1957).
4. Chatt, J., and Shaw, B. L., Chem. and Indusl., 290 (1961).
5. Vaska, L., Chem. and Indust., 1402 (1961).