1. Directive 2010/31/EU Of The European Parliament and of the Council of 19 May 2010 on the Energy Performance of Buildings,2010
2. BUILD UP The European Portal for Energy Efficiency in Buildings
https://www.buildup.eu/en/learn/ask-the-experts/there-difference-between-shall-and-should-epbd-0
3. Synthesis Report on the National Plans for Nearly Zero Energy Buildings (NZEBs): Progress of Member States towards NZEBs;D’Agostino,2016
4. Commission Recommendation (EU) 2016/1318 of 29 July 2016 on Guidelines for the Promotion of Nearly Zero-Energy Buildings and Best Practices to Ensure that, by 2020, All New Buildings Are Nearly Zero-Energy Buildings
http://data.europa.eu/eli/reco/2016/1318/oj
5. New Buildings & NZEBs—2018 Status in February 2018;Erhorn,2018