Hsiao-Tien Pao and  Yi-Ying Li and  Hsin-Chia Fu,  Nonlinear Multivariable Analysis of CO2 Emissions in China.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2016, vol. 115(7). 779 - 783
    [viewed 14 October 2019]. Available from: https://publications.waset.org/pdf/10004945.