1. D. Berger, D. F. Robertson, R. E. Davies, F. Urbach, D. S. Nachtwey, M. M. Caldwell, and R. H. Biggs (1975 ) InImpacts of Climatic Change on the Biosphere (), Monogr. 5, Part 1, pp. 2-235-2 -264 . US Department of Transportation, Springfield, VA.
2. M. M. Caldwell, and A. C. Giese (1971 ) InPhotophysiology (), Vol. 6 . pp. 131 -177 . Academic Press. New York.
3. M. M. Caldwell, O.L. Lange, P.S. Nobel, C. B. Osmond, and H. Ziegler (1981 ) InEncyclopedia of Plant Physiology (), Vol. 12A . pp. 169 -198 . Springer-Verlag, Berlin.
4. THE MIDDLE ULTRAVIOLET REACHING THE GROUND
5. IMPROVED ANALYTIC CHARACTERIZATION OF ULTRAVIOLET SKYLIGHT