1. See, for example, Prout, E. G., and Herley, P. J., J. Phys. Chem., 66, 961 (1962).
2. Boldyrev, V. V., and Eroshkin, V. I., Zhur. Vses. Khim. Ob-va im. Mendeleeva, 9, 704 (1964).
3. Boldyrev, V. V., and Eroshkin, V. I., Russ. J. Phys. Chem., 40, 1 (1966).