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2. An. A. Fedorov, in: Flora of the USSR [in Russian], Moscow-Leningrad (1957), p. 238.
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5. Z. P. Pakudina and A. S. Sadykov, The Distribution in Plants of Flavones and Flavonols and their Glycosides and their Physicochemical Properties [in Russian], Tashkent (1970), p. 21.