7Linqvist O, Johnsson K, Aastrup M. 1991. Mercury in the Swedish environment: Recent research on causes, consequences and corrective methods. Water, Air, and Soil Pol- lution, 55: 19-22.
8Matthew SL, Charles WL, Robert KS, et al. 2007. Ft. McHen- ry tunnel study: Source profiles and mercury emissions from diesel and gasoline powered vehicles. Atmospheric Environ- merit, 41 : 8711-8724.
9Qian JP, Zhang L, Chen HZ, et al. 2007. Hg, Pb content dis- tribution of traffic police' s hair, Guilin, China//Zhu YG, Lepp N, Naidu R, eds. Biogeochemistry of Trace Elements: Environmental Protection, Remediation and Human Health. Beijing: Tsinghua University Press: 491-492.
10Qian JP, Zhang L, Ye J, et al. 2006. The mercury pollution in atmosphere-soil-biology ecosystem along the trunk road in Guilin. Chinese Journal of Geochemistry, 25 ( Suppl. ) : 240.