WASET
    Jens-Phillip Petersen,  The Linkage of Urban and Energy Planning for Sustainable Cities: The Case of Denmark and Germany.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2016, vol. 112(4). 439 - 442
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/10004207.