1. S. M. Adekenov, A. N. Kupriyanov, M. N. Mukhametzhanov, and K. A. Aituganov, “The growth-regulation activity of the extractive substances of some plants of the family Compositae,” paper deposited at VINITI, No. 358–80 (1980).
2. R. D. H. Murray, Fortschr. Chem. Org. Nat.,35, 199 (1978).
3. R. V. Usynina, T. P. Berezovskaya, V. V. Dudko, and N. V. Erofeeva, in: The Investigation of Medicinal Preparations of Natural and Synthetic Origin [in Russian], Tomsk (1975), p. 3.
4. E. L. Rice, Alleopathy, Academic Press, New York (1974).
5. K. S. Rybalko, Natural Sesquiterpene Lactones [in Russian], Moscow (1978), p. 141.