1. American Public Health Association (1980) American Water Works Association and Water Pollution Control Federation. Standard methods for the examination of water and wastewater, 15th edn. American Public Health Association, Washington DC
2. Anderson JM (1986) Photoregulation of the composition, function, and structure of thylakoid membranes. Annu Rev Plant Physiol 37:93–136
3. Baker AL, Baker KK, Tyler PA (1985) A family of pneumatically-operated thin layer samplers for replicate sampling of heterogeneous water columns. Hydrobiologia 22:107–211
4. Begg GW (1990) Policy proposals for the wetlands of Natal and Kwazulu. Natal town and regional planning commission. Report 75. Pietermaritzburg. Z.A
5. Bird DF, Kalff J (1989) Bacterial grazing by planktonic algae. Science 231:493–495