1. Plant leaves and lichens as biomonitors of natural and anthropogenic emissions of mercury;Bargagli,1993
2. The distribution of Cd, Cu, Pb and Zn in topsoils of Osnabrück in relation to land use;Bloemen;Sci. Total Environ.,1995
3. Mosses as biomonitors of heavy metal contamination within urban areas;Brüning,1993
4. Monitoring of heavy metal pollution by Taraxacum officinale;Djingova,1993