1. P. European residential buildings and empirical assessment of the Hellenic building stock, energy consumption, emissions and potential energy savings;Constantinos;Build Environ,2007
2. German federal statistic authority, Bauen und Wohnen – Wohnsituation; 2006. [accessed 20.10.10, in German]. .
3. ENERDATA. Energy efficiency in the European Union 1990–2001. SAVE-Odyssee project on energy efficiency indicators, Enerdata SAin collaboration with the Fraunhofer Institute Systems & Innovation Research; 2003.
4. Energy efficiency trends in buildings in the EU – lessons from the ODYSSEE MURE project. Agence de l’Environnement et de la Maitrise de l’Energie. Enerdata; 2012. .
5. Directive 2002/91/EC of the european parliament and of the council of 16 December 2002 on the energy performance of buildings.