1. E. V. Vul'f and O. F. Maleeva, World Resources of Useful Plants [in Russian], Leningrad (1969), p. 166.
2. G. C. Mustakas, G. Kopas, and N. Robinson, J. Amer. Oil Chemists' Soc.,42, A 550, A 552, A 554, A 594 (1965).
3. E. V. Kucherov, Colewort — A New Oil Crop [in Russian], Moscow-Leningrad (1954).
4. A. E. Grashchenkov, Bot. Zh., 44, 536 (1959).
5. G. M. Balabas, R. A. Butko, A. E. Grashchenkov, I. F. Satsyperova, I. B. Sandina, V. S. Savitskii, and V. S. Sokolov, The Introduction of Medicinal, Aromatic, and Technical Plants [in Russian], Moscow-Leningrad (1965), p. 124.