1. “Energy.” 2021, [Online]. Available: https://ec.europa.eu/eurostat/web/energy/data/shares.
2. “Urban Europe — statistics on cities, towns and suburbs — patterns of urban and city developments,” 2023. [Online]. Available: https://ec.europa.eu/eurostat/statistics-explained/index.php?title=Archive:Urban_Europe_—_statistics_on_cities,_towns_and_suburbs_—_patterns_of_urban_and_city_developments&oldid=298141.
3. Impact of load structure variation and solar thermal energy integration on an existing district heating network;Ben Hassine;Applied Thermal Engineering,2013
4. 5th generation district heating and cooling systems: A review of existing cases in Europe;Buffa;Renewable and Sustainable Energy Reviews.,2019
5. Cabinet of Ministers Republic of Latvia, Latvian building code LBN 003-19 “Building climatology.” 2019.