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2. M. S. Shalyt, Useful Wild Plants of the Turkmen SSR (in Russian), Moscow (1951), p. 222.
3. V. Isaev, Tr. Tadzh. Botan. Sada, Moscow, No. 1, 7 (1932).
4. Plant Resources of the USSR [in Russian], Nauka, Moscow, Vol. 6 (1991), p. 64.
5. N. Kh. Ramazanova, Dissertation ... Candidate of Biological Sciences [in Russian], Tashkent (1975), pp. 40 and 156.