1. R. Zahradník, to be published.
2. L. P. Hammett,Physical Organic Chemistry (McGraw-Hill, New York 1940).
3. R. W. Taft, Jr., J. Amer. chem. Soc.75, 4231 (1953).
4. G. Dallinga, A. A. V. Stuart, P. J. Smith, andE. L. Mackor, Z. Elektrochem.61, 1019 (1957).
5. J. Koutecký andR. Zahradník, to be published.