1. Green building roundtable;Beets;HPAC Heating, Piping, Air-Conditioning Engineering,2008
2. BREEAM,2009. BRE Environmental Assessment Method. 〈www.breeam.org〉 (last accessed 20.09.09).
3. Directive 2002/91/EC of the European Parliament and of the Council of 16 December 2002 on the energy performance of buildings.
4. Directive 2006/32/EC of the European Parliament and of the Council of 5 April 2006 on energy end-use efficiency and energy services and repealing Council Directive 93/76/EEC.
5. 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.