1. European Commission in focus news: https://ec.europa.eu/info/news/focus-energy-efficiency-buildings-2020-lut-17_en, (Last access: 18-06-2022).
2. Refrigerants: There is still no vision for sustainable solutions;Ciconkov;International Journal of Refrigeration,2018
3. Revival of carbon dioxide as a refrigerant;Lorentzen;International journal of refrigeration,1994
4. Hafner A., Pardiñas, Á.Á., 2019. CO2 Refrigeration Technology: possible innovations. Proceedings of the IIR Conference: Ammonia and CO2 refrigeration technologies, Ohrid, Macedonia, 173-180.
5. Sawalha, S. (2008). Carbon Dioxide in Supermarket Refrigeration (Ph.D. dissertation, KTH). Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4753, (Last access: 18-06-2022).