1. P. Grünanger, Methoden der Organischen Chemie (Houben-Weyl), Thieme, Stuttgart (1979), Vol. 7/3b, pp. 235?249.
2. H. C. Joe and P. Jackson, U.S. Patent No. 2769821 (1956); Chem. Abs.,51, 8142 (1957).
3. R. Adams and L. Whitaker, J. Am. Chem. Soc.,78, 658 (1956).
4. A. H. Crosby and R. E. Lutz, J. Am. Chem. Soc.,78, 1233 (1956).
5. K. S. Burmistrov and S. I. Burmistrov, Ukr. Khim. Zh.,44, 832 (1978).