1. Assmuth, T., 1997. Analysis and proposals of guideline values for concentrations of hazardous substances in soil – knowledge base, definition principles, application, development. Suomen ympäristökeskuksen moniste. 92. (in Finnish with English abstract).
2. Äyräs, M., Niskavaara, H., 1992. Kerrossammal (Hylocomium splendens) raskasmetallien bioindikaattorina Rovaniemen kaupungin alueella : ympäristögeokemiallinen tutkimus. Summary: Feather moss (Hylocomium splendens) as a bioindicator of heavy metals in the Rovaniemi urban area: An environmental geochemical study. Geol. Surv. Finland, Rep. Investigat. 108. (in Finnish with English summary).
3. Heavy metals in urban soils of central Jordan: Should we worry about their environmental risks?;Banat;Environ. Res.,2005
4. Magnetic susceptibility as indicator of environmental pollution of soils in Tallinn;Bityukova;Phys Chem Earth A,1999
5. Water quality assessments. A guide to the use of biota, sediments and water in environmental monitoring;Chapman,1996