https://www.cesifo.org/DocDL/cesifo1_wp7982.pdf
https://www.ceps.eu/wp-content/uploads/2021/03/PI2021-05_The-power-surplus.pdf
https://www.ost-ausschuss.de/sites/default/files/pm_pdf/2023%2012%2006%20_%20Position%20concerning%20blockade%20on%20EU-UA%20border_final.pdf
http://www.iata.org/publications/economic-briefings/value-of-air-cargo-2016-summary.pdf