1. Preliminary communication,Czech B., Ratajczak A., Chemica Scripta18, 195 (1981)
2. Ratajczak A., Czech B., Bull. Acad. Polon. Sci., ser. sci. chim.25, 635 (1977); Chem. Abstr.88, 51000z (1978).
3. Oepen G.,Vögtle F., Liebigs Ann. Chem.1979, 1094.
4. Ratajczak A., Czech B., Polish J. Chem.54, 57 (1980).
5. Czech B., Ratajczak A., Polish J. Chem.54, 767 (1980).