1. North Sea Status Quality Report. International Council for the Exploration of the Sea, Fredensborg, Denmark;Anon.,1993
2. Hydrological Review of 2001. National River Flow Archive, Centre for Ecology and Hydrology, UK;Anon.,2001
3. UK National Marine Monitoring Programme — Second report (1999–2001), JNCC, U.K;Anon.,2004
4. North Sea nutrients and eutrophication;Brockmann,1988
5. Phytoplankton growth, microzooplankton grazing, and carbon cycling in marine systems;Calbet;Limnology and Oceanography,2004