1. R. F. Nielsen, J. Amer. Chem. Soc.58, 206 (1936).
2. A. I. Vogel, A Text Book of Practical Organic Chemistry, 3rd ed. London: Longmans Green. 1959.
3. H. Sadek, F. Y. Khalil, andM. T. Hanna, Z. physik. Chem. Neue Folge73, 77 (1970).
4. E. S. Amis, Solvent Effect on Reaction Rates and Mechanisms. New York-London: Academic Press. 1966.
5. A. A. Frost andR. G. Pearson, Kinetics and Mechanism, 2nd ed. New York: J. Wiley. 1961.