p.7 & 15; in ....
De Mora S., Demers S., Vernet M.; 2000; The Effects of UV-radiation in the marine environment; Cambridge University Press, Cambridge - UK;

p.204; in .... Moran M.A., Zepp R.G.; 2000; UV Radiation Effects on Microbes and Microbial Processes; in Kirchman D.L. (ed); Microbial Ecology of the Oceans; Willey-Liss Inc.; New York USA;