por Bhattacharya, Prosun [editor] | International Conference on the Biogeochemistry of Trace Elements (7 : 2003 : Uppsala, Suecia).
por Sajwan, Kenneth S [editor] | Alva, Ashok K [editor] | Keefer, Robert F [editor] | International Conference on the Biogeochemistry of Trace Elements (6 : 2001 : University of Guelph, Ontario).