1. Cadmium;Alloway,1995
2. Organoarsenic compounds in the environment;Andreae,1986
3. Copper;Baker,1995
4. Mercury content of the rocks of Tuscany. A geochemical contribution to geology of Hg-ores;Baroni;Atti Acad. Sci. Siena,1994
5. Global Trends in Wildlife Management.;Bobek,1991