Heavy metals in tropical small catchments in the state of São Paulo, Brazil: A first step towards the establishment of regional “background” levels M.S.M.B. Salomao, A.C. Tomazelli, D.M.L. Silva et D. Santos Jr.J. Phys. IV France, 107 (2003) 1181-1184DOI: https://doi.org/10.1051/jp4:20030511
