1. United Nations Framework Convention on Climate Change, Kyoto Protocol, UNhttps://unfccc.int/kyoto_protocol/items/2830.php
2. European Environment Agency, EEAhttps://www.eea.europa.eu
3. Directive 2009/29/EC of the European Parliament and of the Council of 23 April 2009 so as to Improve and extend the greenhouse gas emission allowance trading scheme of the Community;Off. J. Eur. Union,2009
4. Directive 2010/31/EU of the European Parliament and of the Council of 19 May 2010 (EPBD) on the Energy Performance of Buildings;Off. J. Eur. Union,2010
5. Buildings Performance Institute Europe, BPIE, Nearly Zero Energy Buildings definitions across Europehttp://bpie.eu/publication/nzeb-definitions-across-europe-2015/