1. Beijing Statistical Yearbook;BMBS (Beijing Municipal Bureau of Statistics),2016
2. Planning of Gas Development during the 13th Five-year in Beijing;BMCCM (Beijing Municipal Commission of City Management),2017
3. Beijing Environmental Statement;BMEPB (Beijing Municipal Environmental Protection Bureau),2015
4. Regulation of the Beijing Municipal Reward Replaces Subsidy for the Low-nox Retrofit of Gas (Oil) Boiler;BMEPB (Beijing Municipal Environmental Protection Bureau),2016
5. Hazardous air pollutant emissions from gas-fired combustion sources: emissions and the effects of design and fuel type;England;Chemosphere,2001