1. Pultruded fibreglass: a window frame for the 90s;Wake,1995
2. European Directive on the Energy Performance of Buildings (2002). Directive 2002/91/EC of the European Parliament and of the Council of 16 December 2002 on the Energy Performance of Buildings.
3. Ministry of Climate and Energy, http://www.stm.dk/publikationer/UK_Regeringsgrundlag2007/index.htm.
4. The Danish Building Code;BR,2008
5. Energy performance of glazings and windows;Nielsen;Solar Energy,2000