1. R. M. Murzova, The Introduction and Acclimatization of Plants [in Russian], Fan, Tashkent, No. II (1974), p. 37.
2. A. P. Prekhov, The Chemistry of the Alkaloids of Plants of the USSR [in Russian], Nauka, Moscow (1965), p. 5.
3. S. Yu. Yunusov, Alkaloids [in Russian], FAN, Tashkent (1981), pp. 154–169; Alkaloids (1980–1984) [in Russian], FAN, Tashkent (1984), p. 42.
4. S. Yu. Yunusov, Chemistry in Uzbekistan [in Russian], FAN, Tashkent (1965), p. 26.
5. S. Yu. Yunusov and S. T. Akramov, Dokl. Akad. Nauk UzSSR, No. 5, 38 (1966).