1. http://www.researchandmarkets.com/research/tqrjls/massive_open
. Accessed June 2017
2. Directive 2002/91/EC of the European Parliament and of the Council of 16 December 2002 on the energy performance of buildings.
http://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:32002L0091&from=EN
. Accessed June 2017
3. Directive 2010/31/EU of the European Parliament and of the Council of 19 May 2010 on the energy performance of buildings (recast).
http://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:32010L0031&from=en
. Accessed June 2017
4. BPIE2011, Europe’s Buildings under the Microscope.
http://bpie.eu/wp-content/uploads/2015/10/HR_EU_B_under_microscope_study.pdf
. Accessed June 2017
5. 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.
http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2012:315:0001:0056:en:PDF
. Accessed June 2017