1. Inconsistencies in air quality metrics: ‘Blue Sky’ days and PM10 concentrations in Beijing;Andrews;Environ. Res. Lett.,2008
2. Ardekani, S., Hauer, E., Jamei, B., 2001. Traffic impact models. In: Gartner, N.H., Messer, C.J., Rathi, A.K. (Eds.), Traffic Flow Theory: A State-of-the-Art Report, Transportation Research Board, Washington DC (Chapter 7), available at 〈http://www.tft.pdx.edu/docs/revised_monograph_2001.pdf〉.
3. Beijing Transportation Research Center, 2006–2012. Beijing Transportation Annual Report, available at 〈http://www.bjtrc.org.cn/〉 (in Chinese).
4. The promise of Beijing: evaluating the impact of the 2008 Olympic Games on air quality;Chen;J. Environ. Econ. Manage.,2013
5. Vehicle ownership and income growth, worldwide: 1960–2030;Dargay;Energy J.,2007