WASET
    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 19 April 2024]. Available from: https://publications.waset.org/pdf/10005400.