1. Energy Balances of OECD/non-OECD Countries 2014;IEA,2014
2. International Energy Statistics;U.S. Energy Information Administration,2014
3. Contribution from urban heating to China's 2020 goal of emission reduction;Wang;Environ. Sci. Technol.,2011
4. Comparison of district heating systems used in China and Denmark;Zhang;EuroHeat&Power,2013
5. National Bureau of Statistics of the People's Republic of China, China Statistical Yearbook, China Statistics Press, Beijing, (various years).