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, 4 January 2003.
2. European Union, Directive 2010/31/EU of the European Parliament and of the Council of 19 May 2010 on the energy performance of buildings (recast). Official Journal of the European Union, 18 June 2010.
3. Italian government, Legislative Decree 19 August 2005, n. 192 (D. Lgs. 192/2005), complying the European Directive 2002/91/EC on the energy performance of buildings.
4. Italian government, Legislative Decree 29 December 2006, n. 311 (D. Lgs. 311/2006), modifying and integrating the Legislative Decree 19 August 2005, n. 192 (D. Lgs. 192/2005), complying the European Directive 2002/91/EC on the energy performance of buildings.
5. Italian government, Republic President Decree 2 April 2009, n. 59 (D.P.R. 59/2009), implementing regulation of art. 4, commas 1a) and 1b) of Legislative Decree 19 August 2005, n. 192 (D. Lgs. 192/2005), complying the European Directive 2002/91/EC on the energy performance of buildings.