1. Directive 2012/27/EU of the European Parliament and of the Council. 25 October 2012
2. European Commission. 2010. Europe 2020, A European strategy for smart, sustainable and inclusive growth, 32 p
3. Cabinet Regulation No. 495. Regulations Regarding Latvian Construction Standard LBN 002-01 „Thermotechnics of Building Envelopes”, adopted 27 November 2001.