1. European Union, Directive 2002/91/EC of the European Parliament and of the Council of 16 December 2002 on the energy performance of buildings, Official Journal of the European Communities, January 4, 2003.
2. European Committee for Standardization, Energy performance of buildings. Overall energy use, CO2 emissions and definition of ratings, prEN 15603:2006, Brussels.
3. Energy certification of existing building: comparison between actual and calculated energy demand for space heating;Corgnati,2005
4. Development of an energy rating system for existing houses;Zmeureanu;Energy and Buildings,1999
5. Calculation of building heating demand in EPIQR;Wittchen;Energy and Buildings,2000