1. RIL (1984) Lämmön ja kosteudeneristys, Helsinki, Finland (in Finnish), Suomen Rakennusinsinöörien Liitto
2. The Directive 2010/31/EU of the European Parliament and Council of 19 May 2010 on the energy performance of buildings. In: UNION, O. J. O. T. E. (ed.)
3. ISO 6946:2007 (1996) Building components and building elements—Thermal resistance and thermal transmittance—Calculation method. Berlin, Germany
4. EC (2005) Biomass: green energy for Europe
5. NMAB (1994) Hierarchical structures in biology as a guide for new materials technology, The National Academies Press, Washington DC