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2. Biomass and body-surface area of populations of Enchytraeidae and Lumbricidae (Oligochaeta) in Norwegian coniferous forest soils;Abrahamsen;Pedobiologia,1973
3. Statistical analysis of population density data of soil animals, with particular reference to Enchytraeidae (Oligochaeta);Abrahamsen;Oikos,1970
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5. BBodSchG, 1998. Gesetz zum Schutz vor schädlichen Bodenveränderungen und zur Sanierung von Altlasten (Bundes-Bodenschutzgesetz). Bundesgesetzblatt I, 502 vom 17. März 1998.