Caldwell M M. In a castellnied research in photology, plenum press.New York:1997. 597.
[2]
Albritton D L,Wastson R J. Scientific assessment of stratsopheric ozone change:1988 Globe Ozone Research and Monitoring project Report No.W.WMO.Geneva:1990.
[3]
Y F Zheng,He Yuhong,Yang Yuanyan Zhanqing Li. Effects of increased UV- B upon the ecosystem of grown wheat in China[J].Journal of Photoscience,2002,9(4):166- 169.
[4]
Y F Zheng,W Gao, C H Wang. Yield and Yield Formation of Winter Wheat in Response to Enhanced Solar Ultraviolet- B Radiation[J]. Proceedings of SPIE,2001,7:4482.