1. Climatic change in Britain: is SO2 more significant than CO2?;Balling;Theor. Appl. Climatol.,1992
2. Report of Beijing Environmental Situations of Year 1999, Beijing;Beijing Municipal Environmental Protection Bureau,2000
3. Urban Household Registration Management Implementation for Small Town on the Outskirts of Beijing, in: Office;Beijing Municipal People's Government Office,1995
4. Ecosystem services in urban areas;Bolund;Ecol. Econ.,1999
5. BP Statistical Review of World Energy 2012;BP,2012