1. United Nations – Department of Economic and Social Affairs, “World Urbanization Prospects – The 2014 Revision,” New York, 2014.
2. Heat roadmap Europe 2: Second pre-study for the EU27;Connolly,2013
3. District heating and colling, Lund;Frederiksen,2013
4. 4th Generation District Heating (4GDH): integrating smart thermal grids into future sustainable energy systems;Lund;Energy,2014
5. District heating distribution in areas with low heat demand density;Zinko,2008