1. United Nations, Energy Statistics Pocketbook 2021. Statistics Papers, Serie E N°4, New York, US, 2021. https://unstats.un.org/unsd/energystats/pubs/pocketbook/.
2. United Nations, Energy Statistics Pocketbook 2022. Statistics Papers, Serie E N°5, United Nations, New York, US, 2022. https://unstats.un.org/unsd/energystats/pubs/pocketbook/.
3. T. Abergel, C. Delmastro, Is cooling the future of heating?, (2020) 8. https://www.iea.org/commentaries/is-cooling-the-future-of-heating (accessed April 1, 2022).
4. L. Cozzi, T. Gould, World Energy Outlook 2021, IEA Publ. (2021) 1–386. www.iea.org/weo.
5. IEA, Net, Zero by 2050: A Roadmap for the Global Energy Sector, IEA - International Energy Agency 2021 Paris (France).