Zahra Yazdani Paraii and  Zohreh Yazdani Paraei,  Comparative Study of Ecological City Criteria in Traditional Iranian Cities.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2018, vol. 136(4). 312 - 317
    [viewed 18 November 2019]. Available from: https://publications.waset.org/pdf/10008749.