1. The BOLIG+ project, http://www.boligplus.org/ (in Danish) (accessed 19.11.10).
2. V. Åkarp, http://greenlineblog.com/2009/02/villa-karp-a-positive-net-energy-house-in-malm-sweden/ (accessed 19.11.10).
3. The International Energy Agency (IEA) Net Zero Energy Buildings Database, http://iea40.buildinggreen.com/index.cfm (accessed 19.11.10).
4. Net Zero Energy Homes of the Future: A Case Study of the ÉcoTerraTM House in Canada;Noguchi,2008
5. The Active House project, http://www.activehouse.info/ (accessed 19.11.10).