1. Medicinal Plants [in Russian], Minsk (1967), p. 252.
2. V. P. Makhlayuk, Medicinal Plants in Folk Medicine [in Russian], Saratov (1967), p. 127.
3. H. A. Hoppe and A. Heinz, Drogekunde, 7th ed., Hamburg (1958), p. 41.
4. V. I. Litvinenko and L. I. Borodin, Farmats. Zh., No. 3, 84 (1970).