1. Sampling design in studies of population densities in Enchytraeidae (Oligochaeta).;Abrahamsen;Oikos,1969
2. Ecological study of Enchytraeidae (Oligochaeta) in Norwegian coniferous forest soils.;Abrahamsen;Pedobiologia,1972
3. Zur Ökologie der Collembolen.;Agrell;Untersuchungen im Schwedischen Lappland. Opusc. Ent.,1941
4. illustrated moss flora of Fennoscandia I.;Arnell;Hepaticae. Lund,1956
5. Effects of nitrogen fertilization on the abundance of soil fauna populations in a Scots pine stand.;Axelsson;Royal College of Forestry, Stockholm, Research Notes Nr.,1973