References
- Bannister, T. T. & Laws, E. A., 1980: Modeling phytoplankton carbon metabolism. — In: Falkowski, P. G.(Ed.): Primary productivity in the sea, 243–258. — Plenum Press, New York and London.
- Boutho, V. M., 1976: Controlling the access of nutrients from point and diffused sources with special reference to the Pretoria/Witwatersrand/Vereeniging region. — Water S. A. 4: 145–148.
- CôTé, B. & Platt, T., 1983: Day-to-day variations in the spring-summer photosynthetic parameters of coastal marine phytoplankton. — Limnol. Oceanogr. 28: 320–344.
- Grobbelaar, J. U., 1984: Phytoplankton productivity in a shallow turbid impoundment, Wuras Dam. — Verh. Internat. Verein. Limnol. 22: 1594–1601.
- Grobbelaar, J. U. 1985: Phytoplankton productivity in turbid waters. — J. Plankt. Res. 7: 653–663.
- Grobbelaar, J. U. 1989: The contribution of phytoplankton productivity in turbid freshwaters to their trophic status. — Hydrobiologia 173: 127–133.
- Grobbelaar, J. U., Keulder, P. C. & Stegmann, P., 1980: Some properties of suspended sediment absorbed cations in turbid freshwaters of South Africa. — J. Limnol. Soc. Sth. Afr. 6: 55–58.
- Grobler, D. C. & Toerien, D. F., 1986: The need to consider water quality in the planning of new urban development: A simulation study. — Water S.A. 12: 27–30.
- Middleton, B. J., Pitman, M. V. & Midgley, D. C., 1981: Surface water resources of South Africa. Vol. II, Drainage Region C, The Vaal Basin. — Report No. 8/81 Hydrological Res. Unit, Dept, Water Affairs. E13–E15.
- Platt, T. & Jassby, A. D., 1976: The relationship between photosynthesis and light for natural assemblages of coastal marine phytoplankton. — J. Phycol. 12: 421–430.
- Rooseboom, A., 1978: Sediment afvoer in Suid-Afrikaanse Riviere. — Water S. A. 4: 14–17.
- Sartory, D. P. & Grobbelaar, J. U., 1982: Extraction of chlorophyll a from freshwater phytoplankton for spectrophotometric analysis. — Hydrobiologia 114: 177–187.
- Toerien, D. F., Barnard, J. H. & Pieterse, A. J. H., 1983: Waterkwaliteit in die Modderrivier opvanggebied: 'n Sintese. — Report: University of the Orange Free State, Bloemfontein, R.S.A., 120 pp.
- Tysen, P. D., 1987: Climatic change and variability in Southern Africa. — Oxford University Press, Cape Town, 220 pp.