1. Alliksaar, T. and Punning, J.-M., 1998: The spatial distribution of characterised fly-ash particles and trace metals in lake sediments and catchment mosses in Estonia, Water Air Soil Pollut. 106(3/4), 219?239.
2. Aunela, L., H�s�nen, E., Kinnunen, V., Larjava, K., Mehtonen, A., Salmikangas, T., Leskel�, J., and Loosaar, J., 1995: Emissions from Estonian oil shale power plant, Oil Shale 12(5), 165?177.
3. Berg, T. and Steinnes, E., 1997: Use of mosses (Hylocomium splendens and Pleurozium schreberi) as monitors of heavy metal deposition: From relative to absolute deposition values, Environ. Pollut. 98(1), 61?72.
4. Buse, A., Norris, D., Harmens, H., B�ker., P., Ashenden, T., and Mills, G., 2003: Heavy metals in European mosses: 2000/2001 survey, UNECE ICP Vegetation. CEH, Bangor, Available at http://icpvegetation.ceh.ac.uk/metals_report_pdf.htm.
5. Ilyin, I., Ryaboshapko, A., Afinogenova, O., Berg, T., and Hjellbrekke, A.-G., 2001: Evaluation of transboundary transport of heavy metals in 1999. Trend analysis, EMEP Report no 3/2001, Available at http://www.msceast.org/reps/ER3-2001-AnnexK.pdf.