1. Adams, N.M.: N. Z. J. Bot. l21, 1–2 (1983).
2. Al-Hubaishi, A., Müller-Hohenstein, K.: An Introduction to the Vegetation of Yemen. 271 S. Eschborn: Tz-Verlagsges. 1984.
3. An Enumeration of the Vascular Plants of Xizang (Tibet). 463 pp. Tibetian filial Sci. Kom. 1980.
4. Arealy lekarstvennych i rodstvennych im rastenij SSSR. 208 pp. Leningrad: Universitet 1983.
5. Arktičeskaja flora SSSR, Vol. 9/1. 333 pp. Leningrad: Nauka 1984.