1. European Commission, “Communication from the commission to the European Parliament, the council, the European economic and social committee and the committee of the regions, an EU strategy on heating and cooling.” .
2. Directive 2012/27/EU of the European Parliament and of the council of 25 October 2012 on energy efficiency, amending directives 2009/125/EC and 2010/30/EU and repealing directives 2004/8/EC and 2006/32/EC;EU Commission,2012
3. 4th Generation District Heating (4GDH). Integrating smart thermal grids into future sustainable energy systems;Lund;Energy,2014
4. Smart Energy Systems for coherent 100% renewable energy and transport solutions;Mathiesen;Appl Energy,2015
5. Trends of European research and development in district heating technologies;Sayegh;Renew Sustain Energy Rev,2016