1. Andrén, O. and Lagerlöf, J. The abundance of soil animals (Microarthropoda, Enchytraeidae, Nematoda) in a crop rotation dominated by ley and in a rotation with varied crops. Proceedings of the 7th International Soil Zoology Colloqium. Edited by: Dindal, D. pp.274–279. Washington, D.C.: E.P.A. Soil biology as related to land use practices
2. Andrén, O. and Steen, E. 1978.Effects of pesticides on soil organisms. I. Soil fauna95 (In Swedish, with English summary.) SNV. Stockholm. PM 1082
3. Artemjeva, T. J. and Gatilova, F. G. Soil micro-fauna changes under the influence of various fertilizers. Proceedings of the 5th International Colloquium on soil zoology. Edited by: Vanek, J. pp.463–468. Prague: Academia. Progress in soil zoology
4. The Ecological Importance of Free-Living Soil Nematodes with Special Reference to Those of Moorland Soil