1. Eurostat – Statistics explained. Energy consumption in households2017;https://ec.europa.eu/eurostat/statisticsexplained/index.php/Energy_consumption_in_households#Use_of_energy_products_in_households_by_purpose(accessed 19.09.19).
2. Directive 2010/31/EU of the European Parliament and of the Council of 19May 2010on the energy performance of buildings. http://data.europa.eu/eli/dir/2010/31/oj(accessed 19.09.19).
3. Directive (EU) 2018/844 of the European Parliament and of the Council of 30May 2018amending Directive 2010/31/EU on the energy performance of buildings and Directive 2012/27/EU on energy efficiency. http://data.europa.eu/eli/dir/2018/844/oj(accessed 19.09.19).
4. A field survey of ammonia-water absorption heat pump performance;Noro,2018
5. Lessons learned from long term monitoring of a multisource heat pump system;Lazzarin;Energy Build.,2018