1. N. M. Émanuél', A. N. Rozenberg, V. A. Golubev, et al., USSR Inventor's Certificate No. 1,235,864, Byull. Izobret., No. 21, 83 (1986);
2. USA Patent No. 4,558,127.
3. N. M. Émanuél' (Emanuel), N. P. Konovalova, and R. F. Dyachkovskaya (Diatchkovskaya), Neoplasma,32, 285 (1985).
4. S. Osaki, Y. Ike, H. Mizuno, K. Ishikawa, and H. Mori, Bull. Chem. Soc. Jpn.,50, 2406 (1977).
5. V. D. Sen', E. V. Kapustina, and V. A. Golubev, Izv. Akad. Nauk SSSR, Ser. Khim., No. 8, 1833 (1983); No. 9, 2110 (1983).