http://ec.europa.eu/invest-in-research/pdf/download_en/risk_management.pdf
https://www.ips-journal.eu/topics/economy-and-ecology/why-central-asia-will-not-contribute-to-europes-energy-needs-6590/?utm_campaign=en_1082_20230321&utm_medium=email&utm_source=newsletter
https://www.bwb.gv.at/fileadmin/user_upload/Abschlussbericht_BU_Kraftstoffe_2022_final_barrierefrei.pdf
https://theconversation.com/que-el-dia-tenga-24-horas-y-no-mas-ni-menos-lo-decidieron-los-antiguos-egipcios-209435