1. D. Coulomb, J.L. Dupont, A. Pichard, The Role of Refrigeration in the Global Economy, 29. Informatory Note on Refrigeration Technologies, 2015.
2. EHPA (European Heat Pump Association), 2018, Market report 2020, https://www.ehpa.org/.
3. IEA (International Energy Agency), Heat pumps, Paris, 2020, https://www.iea.org/reports/heat-pumps.
4. European Commission, Communication from the commission to the European parliament, the council, the European economic and social committee and the committe of the regions, Stepping up Europe's 2030 climate ambition investing in a climate-neutral future for benefit of our people, 2020.
5. European Commission, Reguolation of the European parliament and of the Council, establishing the frramework for achieving climate neutrality and amending Regulation (EU) 2018/1999 (European Climate Law), 2020.