Østergaard, Poul Alberg, Henrik Lund, and Brian Vad Mathiesen. “Editorial - Smart Energy Systems and 4th Generation District Heating Systems”. International Journal of Sustainable Energy Planning and Management 16 (May 22, 2018): 1–2. Accessed December 3, 2024. https://journals.aau.dk/index.php/sepm/article/view/2297.