1. I. A. Bessonova and S. Yu. Yunusov, Khim. Prir. Soedin., 736 (1986).
2. The Flora of the USSR [in Russian], Izd. Akad. Nauk SSSR, Moscow-Leningrad, Vol. XIV (1949), p. 222.
3. G. P. Sidyakin, Author's abstract of doctoral dissertation [in Russian], Tashkent (1966).
4. A. Kholmuradov, Author's abstract of Candidate's dissertation [in Russian], Tashkent (1971).
5. D. Kurbanov and S. Yu. Yunusov, Khim. Prir. Soedin., 289 (1967).