1. Isotopic source signatures for atmospheric lead: The Northern Hemisphere;Bollhöfer;Geochimica et Cosmochimica Acta,2001
2. Cu probraze process is proving a hot technology;Bottoms;Materials World,2000
3. Exposure scenarios and guidance values for urban soil pollutants;Boyd;Regulatory Toxicology and Pharmacology,1999
4. Census and Statistics Department 2010 http://www.censtatd.gov.hk/hong_ kong_statistics/statistics_by_subject/index.jsp