Tao Zhao and Xianshuo Xu, Analysis of the CO2 Emissions of Public Passenger Transport in Tianjin City of China. journal = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology. August 2015, vol. 100(4). 417 - 421 [viewed 21 September 2024]. Available from: https://publications.waset.org/pdf/10005400.