6VON STORCH H, COSTA-CABRAL M, HAGNER C, et al. Four decades of gasoline lead esissions and control policies in Europe: a retrospective assessment [J]. Science of the Total Environment, 2003, 211:151 - 176.
8KNEKT P. Is low selenium status a risk factor for hmg cancer?[J]. American Journal of Epidemiology, 1998, 148(10): 975 - 982.
9SUTHERLAND R A. Bed Sediment-Associated Trace Metals in an Urban Stream, Oahu, Hawaii [J]. Environmental Geology., 2000, 39: 611 - 627.
10RODtllGUEZ M J, Arias M L, Grau C J. Heavy metals contents in agrlcuhural topsoils in the Ebro basin (Spain). Applieation of lhe multivariate geoestatistical methods to study spalial variations [J]. Enviromnental Pollution, 2006, 144:1001 - 1012.
