1. Kašpar M., Glogarová M., Hamplová V., Sverenyák H., and Pakhomov S. A.:in Proc. 4th Conference of FLC, Tokyo 1993, Ferroelectrics (1994), in press.
2. Allen C. F. H. and Gates J. W.: Org. Syn.25 (1943) 9.
3. Cope A. C.: Org. Reactions9 (1957) 107.
4. Stevens P. G.: J. Am. Chem. Soc.54 (1932) 3732.