1. A. Biazhei and L. Shutyi,Phenol Compounds of Plant Origin [in Russian], Moscow (1977).
2. Sh. Yu. Islambekov, A. K. Karimdzhanov, S. I. Mavlyanov, et al.,Khim. Prir. Soedin, No. 3, 293 - 295 (1990).
3. T. Hatano, T. Joshida, T. Okuda,Chem. Pharm. Bull., No. 10, 2665 – 2669.
4. S. Ya. Sokolov and I. P. Zamotaev,A Handbook of Medicinal Plants, Moscow (1993), p. 19.
5. V. A. Baraboi,Plant Phenols and Human Health [in Russian], Moscow (1984).