References
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- Hutchinson, T. C., 1973: Comparative studies of the toxicity of heavy metals to phytoplankton and their synergistic interactions. — Water Poll. Research in Canada 8, 178–187.
- Landner, L. & Jernelov, A., 1969: Cadmium in aquatic systems. — In: Metals and Ecology. Symposium, Stockholm. Ecol. Res. Comm. Bull. 5, 47–54.
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- Page, A. L., 1974: Fate and effects of trace elements in sewage sludge when applied to agricultural land. — Environm. Protection Technol. Series. EPA-670/2-74-005. 97 pp.
- Stokes, P. M., Hutchinson, T. C. & Krauter, K., 1973: Heavymetal tolerance in algae isolated from contaminated lakes near Sudbury, Ontario. — Can. J. Bot. 11, 2155–2168.