1. Directive 2009/28/EC of the European Parliament and Council of European Union; 2009. Available from: 〈http://www.eurlex.europa.eu〉/LexUriServ/LexUriServ.do?uri=OJ:L:2009:140:0016:0062:it:PDF. [accessed 03.03.14].
2. European Council act 7224/1/07, Rev. 1. Available from: 〈http://www.consilium.europa.eu/ueDocs/cms_Data/ docs/pressData/en/ec/93135.pdf〉. [accessed 03.03.14].
3. Electricity production and supply statistics. Eurostat.; June 2012. Available from: 〈http://epp.eurostat.ec.europa.eu/ statistics_explained/index.php/Electricity_production_and_supply_statistics〉; 2012 [accessed 03.03.14].
4. A snapshot of global PV 1992-2012—Preliminary information from the IEA PVPS Programme, Rep. IEA-PVPS T1-22; 2013. Available from: 〈http://www.iea-pvps.org〉 [accessed 03.03.14].
5. Trends 2013 in photovoltaic applications—Survey report of selected IEA countries between 1992 and 2012, Rep. IEA-PVPS T1-23; 2013. Available from: 〈http://www.iea-pvps.org/index.php?id=trends 〉 [accessed 03.03.14].