1. Biggs, R.H., Webb, P.G., Garrard, L.A., West, S.H., 1984. The Effects of Enhanced Ultraviolet-B Radiation on Rice, Wheat, Corn, Soybean, Citrus and Duckweed. Environmental Protection Agency Report, EPA, Washington, DC.
2. Indication of increasing solar ultraviolet-b radiation flux in alpine regions;Blumthaler;Science,1990
3. The ozone layer—recent developments;Bojkov;World Meteorological Organisation Bulletin,1994
4. Net photosynthesis, electron transport capacity and ultrastructure of Pisum sativum L. exposed to ultraviolet-B radiation;Brandle;Plant Physiology,1977
5. Brown, S.B., Houghton, J.D., Hendry, G.A.F., 1991. Chlorophyll breakdown. In: Scheer, H. (Ed.), Chlorophylls. CRC Press, Boca Raton, FL.