1. N. N. Kolos, V. D. Orlov, and N. P. Vorob'eva, 13th Ukrainian Conference on Organic Chemistry (Summaries of Papers) [in Russian] ?Ternopol? (1992), p. 152.
2. V. D. Orlov, N. P. Vorob'eva, and N. N. Demenkova, Khim. Geterotsikl. Soedin., No. 3, 328 (1988).
3. L. Southwiek and R. J. Shorda, J. Am. Chem. Soc.,81, 3298 (1959).
4. A. Kabra and G. S. Saharia, Def. Sci. J.,25, 28 (1975); Chem. Abstr., 83, 173129 (1975).
5. N. K. Kochetkov (ed.), General Organic Chemistry [in Russian], Khimiya, Moscow (1988), Vol. 8, p. 730.