1. Äyräs, M., Reimann, C., 1995. Ecogeochemistry Kola-Field Manual. Geological Survey of Norway, Trondheim, NGU Rep. 95.111.
2. Comparison of sulphur and heavy metal contents and their regional distribution in humus and moss samples from the vicinity of Nikel and Zapoljarnij, Kola Peninsula, Russia;Äyräs;Water, Air Soil Pollut.,1997
3. Regional patterns of heavy metals (Co, Cr, Cu, Fe, Ni, Pb, V and Zn) and sulphur in terrestrial moss samples as indication of airborne pollution in a 188,000 km2 in northern Finland, Norway and Russia;Äyräs;J. Geochem. Explor.,1997
4. Visualization of geochemical data on maps: new options;Björklund;J. Geochem. Explor.,1987
5. Chekushin, V., Bogatyrev, I., Finne, T.E., Misund, A., Niskavaara, H., Pavlov, V., Volden, T., Äyräs, M., 1993. Report on joint ecogeochemical mapping and monitoring in the scale of 1:1 million in the West Murmansk region and the contiguous areas of Finland and Norway. Geological Survey of Norway, Trondheim, NGU Rep. 93.152.