1. Enrichment of trace elements from sewage sludge fertilizers in soils and plants;Anderson;Ambio,1972
2. Trace elements in biochemistry;Bowen,1966
3. Effect of soil enrichment with mineral elements and fertilizers on surface water and plants;Cottenic;Soil Bulletin,1971
4. The vailability of Cr, Ni, Zn, Cd, Sn and Pb for Plants;Kick,1971