1. Crossland, N. O., Heimbach, F., Hill, I. R., Boudou, A., Leeuwangh, P., Matthiessen, P., and Persoone, G. Summary and Recommendations of the European Workshop on Freshwater Field Tests (EWOFFT), Potsdam, Germany, 1993, 37.
2. Designing a microcosm bioassay to detect ecosystem level effects