1. A. V. Blagoveshchenskii, Plants Biochemistry [in Russian], Moscow (1934).
2. A. N. Goldovskii, citing S. Ya. Zolotnitskaya.
3. S. Ya. Zolotnitskaya, Dokl. Akad. Nauk Arm. SSR,8, No. 1, 25–31 (1948).
4. V. S. Sokolov, Alkaloid Plants of USSR [in Russian], Moscow (1952),
5. Yu. V. Rakitin, Use of Growth Stimulants in Plant Growing [in Russian], Moscow (1947).