1. Anonymous, 1981. Water. Spectrophotometric determination of chlorophyll a content. NEN 6520, Dutch Organization for standardization. Delft, The Netherlands.
2. Anonymous. 1988. Ecological rehabilitation of the River Rhine: A proposal for a Netherlands research programme.Publications and reports of the project Ecological Rehabilitation of the River Rhine, no. 1, The Netherlands. 15 pp.
3. , , and . 1981. Onderzoek naar een geschikte combinatie toetsmethoden ter bepaling van de aquatische toxiciteit van milieugevaarlijke stoffen. National Institute of Public Health, report no. 627905 001, Bilthoven, The Netherlands, 102 p.
4. Impact of biological activity on detritus transported in the lower river Rhine: an exercise in ecosystem analysis
5. The toxic effects of pollutants on the mineralization of acetate in subsoil microcosms