Østergaard, Poul Alberg, Henrik Lund, and Brian Vad Mathiesen. “Smart Energy Systems and 4th Generation District Heating”. International Journal of Sustainable Energy Planning and Management 10 (June 30, 2016): 1–2. Accessed November 21, 2024. https://journals.aau.dk/index.php/sepm/article/view/1527.