1. G. Binsch, J. Am. Chem. Soc.,91, 1304 (1969).
2. L. M. Jackman and F. A. Cotton (eds.), Dynamic Nuclear Magnetic Resonance Spectroscopy, Academic Press, New York (1973), p. 653.
3. A. Steigel, NMR Basic Principles and Progress, Vol. 15 (1978), p. 1.
4. G. M. Whitesides and J. S. Fleming, J. Am. Chem. Soc.,89, 2855 (1967).
5. L. P. Olekhnovich, N. I. Borisenko, Z. N. Budarina, V. P. Metlushenko, Yu. A. Zhdanov, and V. I. Minkin, Zh. Org. Khim.,18, 1785 (1982).