Trømborg, Erik, Monica Havskjold, Torjus Folsland Bolkesjø, Jon Gustav Kirkerud, and Åsa Grytli Tveten. 2017. “Flexible Use of Electricity in Heat-Only District Heating Plants”. International Journal of Sustainable Energy Planning and Management 12 (March). Aalborg, Denmark:29-46. https://doi.org/10.5278/ijsepm.2017.12.4.