1. S. A. Baisalbaeva, T. T. Omarov, E. T. Nikitina, et al., Khim.-Farm. Zh., 21(2), 191 (1987).
2. Ts. E. Agadzhanyan, G. L. Arutyunyan, Yu. Z. Ter-Zakharyan, et al., USSR Patent 1162195 (1984).
3. A. I. Kuznetsov, E. B. Basargin, and B. V. Unkovskii, USSR Patent 1225843; Byull. Izobret., No. 15 (1986).
4. A. I. Kuznetsov, E. B. Basargin, M. Kh. Ba, et al, Khim. Geterots. Soedin., No. 5, 647–653 (1989).
5. Ts. E. Agadzhanyan and G. L. Arutyunyan, Arm. Khim. Zh., 34, 963–968 (1981).