1. Key world energy statistics 2015;International Energy Agency (IEA),2015
2. 2020 communication from the commission, Europe 2020 a strategy for smart;European Commission COM,2010
3. European Commission COM (2011) 21. Communication from the commission to the European parliament, the council, the European and economic and social committee and the committee of the regions, a resource-efficient Europe — Flagship initiative under the Europe 2020 strategy.
4. European Commission. Directive 2004/8/EC of the European Parliament and of the Council of 11 February 2004 on the promotion of cogeneration based on a useful heat demand in the internal energy market and amending Directive 92/42/EEC.
5. Impact of support schemes and barriers in Europe on the evolution of cogeneration;José Antonio Moya;Energy Policy,2013