1. European Council. Directive 2009/28/EC of the European Parliament and of the Council of 23 April 2009 on the promotion of the use of energy from renewable sources and amending and subsequently repealing Directives 2001/77/EC and 2003/30/EC; 2009.
2. European Commission. COM(2011)370 final, Proposal for a Directive of the European Parliament and of the Council on Energy Efficiency and repealing Directives 2004/8/EC and 2006/32/EC. Brussels: Official Journal of the European Union; 2011.
3. Energy Information Administration. International energy outlook 2011, Washington: US Department of Energy–Energy Information Administration; 2011.
4. European Commission. Survey of the observatory of European SMEs. Brussels, Begium; 2007.
5. EIM Business and Policy Research. Do SMEs create more and better jobs? Brussels, Belgium; 2011.