1. International Energy Agency, Key World Energy Statistics, 2006.
2. Energy Information Administration, International Energy Outlook 2006, U.S. Department of Energy, June 2006.
3. Directive 2002/91/CE of the European Parliament and of the Council of 16 December 2002 on the energy performance of buildings, 2002.
4. Ministerio de Economía, Estrategia de ahorro y eficiencia energética en España 2004–2012, Noviembre 2003.
5. HVAC systems energy comparisons for an office building;Pérez-Lombard,2004