1. Directive 2010/31/EU of the European parliament and of the council on the energy performance of buildings.: Europen Union; 2010.
2. Direcitve 2002/91/EC of the European parliament and of the council on the energy performance of buildings.: European Union; 2003.
3. Thermal upgrades of existing homes in Germany: the building code, subsidies, and economic efficiency;Galvin;Energy and Buildings,2009
4. Energy-efficient houses built according to the energy performance requirements introduced in Denmark in 2006;Tommerup;Energy and Buildings,2006
5. Jensen O, Hansen M, Engelund Thomsen K, Wittchen K. Development of a 2nd generation energy certificate scheme—Danish experience. In: ECEEE 2007 summer study, saving energy—Just do it!; 2007.