1. Aston, S. R. and Chester, R. The influence of suspended particles on the precipitation of iron in natural waters. Estuarine Coastal Mar. Sci. 1, 225?231 (1973).
2. Driel, W. van, The effect of iron ethylenediaminetetraacetic acid on the growth and metabolism of tomato plants in water cultures. Plant and Soil 20, 85?104 (1964).
3. Groot, A. J. de, Origin and transport of mud in coastal waters from the Western Scheldt to the Danisch frontier, in L. M. J. V. van Straaten (Ed.), Deltaic and Shallow Marine Deposits. (Elsevier, Amsterdam), p. 91?103 (1964).
4. Groot, A. J. de, Mobility of trace elements in deltas. Trans. Comm. II and IV. Intern. Soc. Soil Sci., Aberdeen, 267?269 (1966).
5. Groot, A. J. de, Occurrence and behaviour of heavy metals in river deltas, with special reference to the Rhine and Ems river, in E. D.Goldberg (Ed.), North Sea Science (MIT Press, Cambridge, Mass.) p. 308?325 (1973).