1. Agrell, I.: Zur Ökologie der Collembolen. Opusc. Ent. Suppl. III, 1?236 (1941)
2. Anderson, J.M., Healey, I.N.: Seasonal and inter-specific variation in major components of the gut contents of some woodland Collembola. J. Anim. Ecol. 41, 359?368 (1972)
3. Barlow, C.A.: A factorial analysis of distribution in three species of diplopods. Tijdschr. Ent. 100, 349?426 (1957)
4. Birch, L.C.: The role of environmental heterogeneity and genetical heterogeneity in determining distribution and abundance. Proc. Adv. Study Inst. Dynamics Numbers Popul. (Oosterbeek, 1970), 109?128 (1971)
5. Bödvarsson, H.: Alimentary studies on seven common soil-inhabiting Collembola of Southern Sweden. Entomol. scand. 1, 74?80 (1970)