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2. Balabas, G. M., Buiko, R. A., Grashenkov, A. E., Satziperova, I. F., Sandina, I. B., Sinitzki, B. S. and Sokolov, B. S. 1965.Introduction of Medicinal, Aromatic and Technical Plants, 331–334. Moscow—Leningrad: Nauka Publishing.
3. Medical News
4. Personal observation by the editors