- Risholt Birgit, Kvande Tore, Time Berit, Hestnes, Anne Grete (2011). Strategies for renovation of single family dwellings from the 1980s towards zero-energy levels. 2011 Helsinki World Sustainable Building Conference Proceedings. (s. 312-313). Helsinki: Finnish Association of Civil Engineers RIL; VTT Technical Research Centre of Finland.
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