WASET
    M. A. Spielmann and  L. Schebek,  Long-Term Economic-Ecological Assessment of Optimal Local Heat-Generating Technologies for the German Unrefurbished Residential Building Stock on the Quarter Level.   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2016, vol. 120(12). 1605 - 1615
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/10006040.