Margaritis, Nikolaos, Dimitrios Rakopoulos, Evangelia Mylona, and Panagiotis Grammelis. “Introduction of Renewable Energy Sources in the District Heating System of Greece”. International Journal of Sustainable Energy Planning and Management 4 (February 27, 2015): 43–56. Accessed April 20, 2024. https://journals.aau.dk/index.php/sepm/article/view/685.