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2. T. A. Geissman, The Chemistry of Flavonoid Compounds, Pergamon Press, New York (1962), P. 107.
3. L. K. Klyshev, V. A. Bandyukova, and L. S. Alyukina, Plant Flavonoids [in Russian], Nauka, Alma-Ata (1978), p. 26.
4. V. A. Bandyukova, Khim. Prir. Soedin., 58 (1967).
5. Z. P. Pakudina and A. S. Sadykov, The Distribution of Flavones, Flavonols, and Their Glycosides in Plants, and Their Physicochemical Properties [in Russian], Fan, Tashkent (1970), p. 24.