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2. World Energy Outlook 2012;International Energy Agency,2012
3. Contribution of Energy Efficiency Measures to Climate Protection within the European Union to 2050;Fraunhofer Institute for Systems and Innovation Research ISI,2012
4. Gas and Thermally Driven HVAC Systems;Macchi,2012
5. Micro-CHP edging towards the mass market;Dijkstra;Cogeneration and On-Site Power Production, Pennwell,2009