1. S. S. Azizova, I. V. Markova, I. B. Mikhailov, and Z. A. Khushbaktova, Cardiac Glycosides [in Russian], Izd-vo Ibn Siny, Tashkent (1992).
2. I. F. Makarevich and É. P. Kemertelidze, Transformed Cardiac Glycosides and Aglycons and Their Biological Activity [in Russian], Metsniereba, Tbilisi (1984).
3. R. Sh. Yamatova, N. K. Abubakirov, and A. D. Turova, USSR Inventors' Certificate No. 139,051, Byull. Izobret., No. 12, 38 (1961).
4. N. Sh. Pal'yants, M. B. Gorovits, and N. K. Abubakirov, Khim. Prir. Soedin., 765 (1976).
5. N. Sh. Pal'yants and N. K. Abubakirov, Khim. Prir. Soedin., 656 (1978).